Southern indian ocean
'MH370 search likely to last for years'
A US official said the search for missing Malaysia Airlines Flight MH370 is likely to drag on for years.
Australia vowed to keep searching for the missing Malaysian plane despite no sign of any wreckage.
The Bluefin-21 will keep scouring the Indian Ocean floor after it finishes its current targeted search.
The drone was forced to end its first deployment into what was meant to be a 16-hour operation.
The introduction of the undersea drone marks a new slower paced phase in the search.
Efforts are now focused on two areas about 2,240 km northwest of Perth.
The signals bring to four the number of overall pings detected in recent days within the search area.
11 military aircraft, four civilian aircraft and 14 ships are taking part in the search.
Officials say the hunt was at a critical stage as the batteries of the plane's black box were dying.
A ship has detected signals consistent with aircraft black boxes in the Indian Ocean.
The pulse signal, with a frequency of 37.5 kHz per second, is emanating from the south Indian Ocean.
The Malaysia Airlines jetliner went missing four weeks ago with 239 people on board.
A towed pinger locator will be pulled behind navy ship HMAS Ocean Shield.
Najib Razak joined his Australian counterpart Tony Abbott at RAAF Base Pearce near Perth.
The search is now focused on an inhospitable 221,000 sq km swathe of the southern Indian Ocean.
The correction was made as Malaysian authorities face heavy criticism for mismanaging the search.
A New Zealand air force plane had spotted objects in the new search area.
New satellite images have revealed more than 100 objects that could be debris from the Boeing 777.
The images were captured by France-based Airbus Defence & Space on Monday.