Updated Mon 21 Apr 2014, 4:26pm AEST
ABC NEWS
Photo: Map from AMSA shows the planned search area for Malaysia Airlines flight MH370 on April 21, 2014. (Supplied: AMSA)
Gallery: The search for MH370
Map: Australia
Two-thirds of the planned underwater search for missing Malaysia Airlines flight MH370 has been completed, with no wreckage found.
As many as 10 military aircraft and 11 ships are taking part in the search for the aircraft, which was carrying 239 people when it vanished on March 8 en route to Beijing from Kuala Lumpur.
Flight MH370 inexplicably diverted from its course and is thought to have crashed into the Indian Ocean.
No debris from the plane has been found despite an intensive air-and-sea search and hopes now centre on the autonomous underwater vehicle (AUV) Bluefin-21 of finding wreckage on the Indian Ocean seabed.
"Bluefin-21 has searched approximately two-thirds of the focused underwater search area to date," the Joint Agency Coordination Centre (JACC), which is managing the search, said in a statement.
"No contacts of interest have been found to date."
The torpedo-shaped sonar scanning device has so far made eight missions to the vast depths of the ocean with no result, despite exceeding its operating limit of 4,500 metres.
The Bluefin-21 commenced its ninth mission this morning.
Authorities believe acoustic signals picked up from the seabed far off the West Australian coast by specialist US equipment - known as a towed "pinger" locator - are the best lead so far in solving the mystery.
With the batteries of the black box beacons now thought to have expired, experts are scouring the seabed in the vicinity of the transmissions to find their source.
"The focused underwater search area is defined as a circle of 10-kilometre radius around the second towed pinger locator detection which occurred on April 8," JACC said.
The Australian Maritime Safety Authority says the visual search area today would total about 49,500 square kilometres.
The centre of the search area, which will be conducted by all the planes and all but one of the ships, is about 1,750 kilometres north-west of Perth.
The weather in the region is forecast to deteriorate later today, particularly in the northern sector, as Tropical Cyclone Jack continues its track south.
Widespread showers were developing, with isolated thunderstorms to the north and east south-easterly winds.
Authorities have indicated they may reassess within days how to approach the extremely challenging search for the plane, expected to be the costliest in aviation history, given that nothing has been found so far.
Malaysia's government and the airline have come under harsh criticism from Chinese relatives of MH370 passengers, two-thirds of whom were Chinese, over their handling of the incident.
Earlier today, a Malaysia Airlines plane with 166 people aboard was forced to make an emergency landing in Kuala Lumpur in another blow to the airline's safety image.
Flight MH192, bound for Bangalore in India, turned back after it was discovered that a tyre had burst on take-off, the airline said.
More stories on this
* MH370 search at 'critical juncture',
* Malaysia says Australia, Malaysia work on deal over MH370 recovery
* Submarine fails to find any trace of flight MH370
* Submarine completes first dive in search for debris
* Search for MH370 heads underwater without black box signal
AFP
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