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7:12pm: VIDEO: The Australian Maritime Safety Authority has released a video wrap up of the day's search action.
You can watch what AMSA General Manager John Young had to say below.
6:30pm: We are going to now suspend live coverage as we await news from the search zone.
A quick wrap of what happened today.
The first plane left Perth at about 9.15am. Now four other planes have either reached the search area or are on their way there.
A Norwegian merchant ship has also been searching the area, 2500km southwest of Perth, since Thursday night, with another due to arrive tonight.
So far, nothing has been found.
Meanwhile, Prime Minister Tony Abbott has defended his decision to announce the potential breakthrough yesterday in parliament, saying Australia "owed it" to the families of those on the missing plane to give them information as soon as it comes to hand.
5:45pm: Brett Campany from Wild Blue Helicopters in the Margaret River region of Western Australia took some photos and a video of a search plane flying overhead this afternoon en route to the possible site where debris potentially from missing flight MH370 was found.
This is what he said regarding the footage, which you can view below:
"Check out the contrails of the Rescue Aircraft on its way to the search area for the MH370 debris to the South West of Margaret River."
4:20pm: Ross Verne: The patch of ocean where search efforts are focused on finding pieces of debris potentially from missing flight MH370 is one of the most treacherous in the world, with survival in freezing waters near-impossible and recovery efforts likely to take months or years.
This is the view of University of Western Australia professor of coastal oceanography Charitha Pattiaratchi who said the conditions and the amount of time since the plane was lost meant any survivors from the crash would have since perished.
“With the amount of time that has passed it would be a recovery operation,” he said.
“You wouldn’t last an hour in the water because of the temperatures.”
Read the full story here.
4:09pm: Here's a video from RAAF Base Pearce north of Perth, where the planes are leaving from.
AKA "the waiting game".
3.55pm: According to AMSA, the planes can communicate back while they in the search area if they should find anything.
It is about a 7 hour round trip from Perth to the search area by air (depending on weather conditions).
The aircraft have about 2 hours of search time when they get there. That means that the first plane that set out this morning at 9.15am (Australian Eastern Daylight Savings Time) should now be on its way back.
The planes that left around 11.15am and 11.30am should have reached the search area by now.
The fourth plane, which left at about 12.45pm would almost be at the search area.
A fifth plane is due to leave Perth at 4pm.
3.50pm: We know that a satellite owned by US company DigitalGlobe took the images of the missing debris. But who provided them to AMSA?
Ben Grubb reports that: Spokeswoman Lisa Martin has told Fairfax Media that Australian intelligence agency, Defence Imagery and Geospatial Organisation provided AMSA with the satellite imagery from March 16 that shows two objects in the Indian Ocean.
She said DIGO was scouring through DigitalGlobe's imagery and not AMSA. She did not know how many personnel at Defence were looking over the imagery.
3.45pm: AP reports that China is sending three ships to search for the possible pieces of the Malaysia Airlines plane, the government said today.
It has not been reported where the ships are coming from, or when they might arrive.
However, previous reports have said that ships have been searching near Sumatra.
Funny, but Tony Abbott did not mention this after his conversation with Chinese President Xi Jinping.
3.37pm: AMSA's website has been straining under the increased interest now that it is spearheading the search effort for MH370. It has been down on and off today.
AMSA spokeswoman Lisa Martin says the reason ASMA's website has often not been accessible is due to the fact it had been inundated with visitors, especially by people in the media.
"Normally there are only 30 people active on it at any one time. Now there are around 1000 at any one time," she said, adding that AMSA's Twitter following has increased by 10,000 followers overnight.
3:01pm: There have been some eyebrows raised about the fact that Tony Abbott made his announcement to parliament about the debris before any effort could be launched to find it.
But as we noted earlier, he made a passionate defence of the way he played things, when asked in a press conference in PNG.
He said that not only did Australia owe it to the families of those on board to "do everything we can to solve this ..."[we] owe it to them to give them information as soon as it's to hand".
2.41pm: Four aircraft have now left Perth for the search area in the southern Indian Ocean, AMSA has announced.
A RAAF P3 Orion left at about 12.45pm (AEST).
It will join two other P3 Orions and an ultra long range Bombadier Global Express jet. A US Navy P8 Poseidon plane will leave at about 4pm.
2.30pm: The delegation was sent after satellite data showed that the plane had likely flown for hours after it went missing.
Philip reports that families have questioned why it took so long to verify the data.
(This follows a Wall Street Journal report that officials took four days to act on the satellite information that showed the plane had flown for several hours away from the area being covered.)
2.24pm: Fairfax China correspondent Philip Wen has been at the Lido Hotel in Beijing, where the families of some of the passengers on board MH370 are staying.
He reports they have spent the morning being briefed by a senior Malaysian delegation - sent by Malaysian PM Najib Razak - that arrived on Thursday night.
They included representatives from the Malaysian defence force, civil aviation authority and a Boeing 777 pilot.
2.09pm: The Age's political editor Michael Gordon is travelling with the Prime Minister in PNG.
While Tony Abbott's press conference obviously dealt with Manus Island issues, the missing plane was also discussed.
Given there have been no sightings of any debris possibly linked to the missing plane, the PM gave a passionate defence of his decision to make a statement to parliament on Thursday on the discovery of the satellite images.
He said we all owed it to the loved ones of those missing to crack this "extraordinary riddle".
Mr Abbott described the search as a "gut wrenching business" and acknowledged that what was shown in the images could potentially be a discarded shipping container.
He also described the search area as the the most inaccessible spot you could imagine on the face of the planet.
1:21pm: The Norwegian cargo ship Hoegh St Petersburg was the first ship to reach the search area.
It searched through the night, even though the official search was called off.
The CEO of Hoegh Autoliners, Ingar Skiaker, has told reporters from Oslow that "we consider this an emergency situation and we will continue until further notice".
"If there any survivors spotted, we will have the means to take them on board."
11:49am: WorldView-2, owned by US satellite company DigitalGlobe, provides imagery at a resolution of approximately 50cm. It takes a new image of any place on earth every 1.1 days (1 day, 2 hours and 24 minutes), writes deputy technology editor Ben Grubb.
DigitalGlobe confirmed on Friday that it was the one who provided the Australian Maritime Safety Authority (AMSA) with the satellite images that were captured on March 16, showing the two objects in the Indian Ocean.
“We have been informed by an Australian government official that it was our imagery Prime Minister Abbott referred to in his recent comments,” the company said in a statement.
11:12am: The Australian Maritime Safety Authority has just released its latest update, stating that two more aircraft were due to depart for the search area a short time ago, at 11am AEDT.
The civil Gulfstream jet and a second RAAF P3 Orion will take over the search from the RAAF P3 Orion that set out at 9.15am AEDT.
Due to the distance to and from the search area (about a four-hour flight each way), each aircraft will only have about two hours of search time.
AMSA says a total of five aircraft will be involved in today's search, with a third RAAF P3 Orion due to depart about 1pm AEDT.
A United States Navy P8 Poseidon will set off for the search area about 4pm AEDT.
One merchant vessel is currently in the search area, with a second due to arrive tonight.
10:28am: Weather conditions appear to be quite bad at Pearce RAAF base, near Perth, this morning. That's where the search planes are setting off from.
10:22am: One of the world’s top air accident investigators says the missing Malaysia Airlines jet may never be found if it came down in the Indian Ocean, according to the Financial Times.
Rémi Jouty, head of the Bureau d’Enquêtes et d’Analyses, the French air accident investigation branch, said much more work was needed before any undersea search could start if debris did indeed turn out to be from the missing aircraft.
“The only thing I can say is it will be most difficult and the recovery [of the wreckage on the seabed] is not guaranteed,” Mr Jouty told the Financial Times.
10:09am: The first search plane took off from Pearce RAAF base in Western Australia at 6.15am Perth time on Friday, which is 9.15am eastern daylight time.
Four planes will be involved in today's search, and their departure times will be staggered throughout the day. The next plane is due to leave at about 8am Perth time, or 11am eastern daylight time.
It takes about four hours for the aircraft to reach the search zone.
10:01am: If the debris in the southern Indian Ocean is confirmed to be from Malaysia Airlines flight MH370, it would eliminate some of the wilder theories about what happened to the plane, writes Anne Davies.
It would point instead towards the likelihood of an emergency on the flight, and an attempt by the crew to turn back and complications that caused them to fall into unconsciousness, leaving the plane on a ghost flight until it ran out of fuel.
9:51am: Fairfax Media journalist Liam Ducey was on board an RAAF Hercules aircraft as it scoured a stretch of ocean off Australia’s west coast. Here he writes of the ongoing search for missing Malaysia Airlines Flight 370.
9:42am: A photographer due to take off on a search plane from Pearce RAAF base on Friday morning has reported a lot of lightning over the area.
"It's windy, it's wild, the media are having terrible trouble with keeping their kits up," said photographer Bohdan Warchomij.
Fairfax Media reporter Peter Hannam has spoken to Ben Domensino, a senior meteorologist with Weatherzone, who says weather conditions over the search area look likely to improve for a couple of days at least.
Domensino says a high pressure ridge will be passing to the south of the search area over the weekend. This will allow wind and seas to ease and allow some clearing, which would help the search effort.
Another trough may move back into the region early next week, around Tuesday or Wednesday. This should bring more cloud and rain and cause wind to increase
9:24am: Prime Minister Tony Abbott on Friday morning said that Australia was ‘‘throwing all the resources we can at it [the search operation]’’.
‘‘We will do everything we humanly can to try to get to the bottom of this,’’ he said.
‘‘We don’t know what that satellite saw until we can get a much better, much closer look at it but this is the first tangible breakthrough in what up until now has been an utterly baffling mystery.
‘‘We do have pretty strong satellite imagery and obviously this is a very serious lead in the way that nothing else so far really has been.’’
9:18am: The search for potential wreckage in the southern Indian Ocean is painstaking. But the wait for families of those on board Flight MH370 must be agonising.
Families huddled around television screens on Thursday as news broke that possible debris from the plane had been spotted.
"It gets your heart racing ... I will tell you that, but it could just be nothing. We don't know and neither do they,’’ said Sara Weeks, whose brother Paul Weeks was aboard the missing flight.
9:10am: Peter Hartcher reports that, when the Australian official took the podium to explain to reporters the discovery of satellite images that might show pieces of MH370, he carefully omitted to tell them the source.
The images were from a US satellite. The Australian Maritime Safety Authority's John Young didn't mention this to the media. Nor was he asked. But he wouldn't have disclosed it in any case.
As ever, Australian officialdom is hyper protective of US intelligence and its sources - even more protective than the Americans themselves.
9:01am: Fairfax Media reporter Patrick Hatch reports that seven Victorian State Emergency Service (SES) volunteers have flown to Western Australia to help search for the missing flight.
SES spokeswoman Sally Lowenstein said the volunteers had been trained as air observers by the Australian Maritime Safety Authority, and flew out of Essendon Airport on a search-and-rescue plane about 5am on Friday.
“That plane is based in Victoria and that’s why they’ve taken a Victorian crew as well,” she said.
The volunteers will work from RAAF Base Pearce, north of Perth, until Wednesday.
8:52am: So remote is the search zone, in the Indian Ocean 2500 kilometres south-west of Perth, that it takes aircraft about four hours to reach the area.
When they arrive, they only have enough fuel to search for two hours, before heading back to base.
8:46am: The Age's Steve Lillebuen has contacted Norwegian cargo ship Höegh St Petersburg, which has been diverted to the search area.
But the skipper declined to answer any questions about the search or current weather conditions, referring inquiries to AMSA.
An AMSA spokeswoman had no further updates.
The Höegh St Petersburg, a car carrier, was en route from South Africa to Australia when it was diverted.
Other vessels heading to the search zone include the Australian navy ship HMAS Success, which is due to reach the area on Saturday.
8:41am: One of the planes scouring the southern Indian Ocean on Thursday afternoon did detect several objects on its radar - but it turned out to be a false alarm.
One was a freighter, and two others were pods of dolphins.
David Wright, from US news organisation ABC, was on board the P-8 Poseidon plane that was sent to the area where debris from the airplane was potentially identified.
Wright said searchers were posted at all of the plane's windows, and the plane worked back and forth through its search area in a ‘‘lawn mowing pattern’’.
8:28am: At 8am, the Australian Maritime Safety Authority released this update about today's operation:
"Today’s search will utilise four military aircraft, including two RAAF Orions, tasked by the Australian Maritime Safety Authority (AMSA) to search a 23,000 kilometre area, about 2500 kilometres south-west of Perth.
"A merchant ship remains in the search area. Another merchant ship is en route to the area and is expected to arrive tonight.
"A total of six merchant ships have assisted in the search since a shipping broadcast was issued by AMSA on Monday night."