Chinese and Australian ships searching for missing flight MH370 have picked up separate acoustic signals in different parts of the southern Indian Ocean and are trying to verify if one could be from the plane's black box recorders.
Retired Australian Air Chief Marshal Angus Houston, head of the international search, earlier said Chinese patrol vessel Haixun 01 picked up two "acoustic events" some 1,000 miles (1,600km) northwest of Perth.
The first was a faint signal. The second was picked up around 1.2 miles (2km) away and lasted for 90 seconds, he said.
They had a "ping" of 37.5kHz frequency - the same emitted by black box flight recorders.
The location where the signal was detected More planes and ships were sent to assist in that area, but in the meantime Australia's HMAS Ocean Shield had reported a separate "acoustic event" some 345 miles (555km) away.
The Ocean Shield is carrying sophisticated US Navy equipment designed to pick up signals sent from the black boxes.
A Chinese air force plane also spotted a number of white floating objects in the area, said Chinese state news agency Xinhua.
Mr Houston stressed that investigators are still a "long way" from concluding the signals are from the Boeing 777 carrying 239 people.
But he said they are "an important and encouraging lead" and show "some promise and require a full investigation".
The Malaysia Airlines plane vanished on March 8 Earlier, Australian Prime Minister Tony Abbott told reporters in Tokyo: "This is the most difficult search in human history.
"We are searching for an aircraft which is at the bottom of a very deep ocean and it is a very, very wide search area.
"We need to be very careful about coming to hard and fast conclusions too soon."
Anish Patel, president of Dukane Seacom, the company that made the black box locator, told Reuters: "The 37.5kHz is the specific frequency that these locator pingers operate on.
Hishammuddin Hussein at a news conference in Malaysia on Saturday "It's a very unique frequency, typically not found in background ocean noise," such as whales or other marine mammals, he added.
A dozen planes and 13 ships are scouring three areas about 1,240 miles (2,000 km) northwest of Perth.
Malaysia said on Saturday it had launched a formal investigation into the plane's disappearance that would include experts from Britain, Australia, the US, China and France.
The country's acting transport minister Hishammuddin Hussein said it would be made up of three groups.
The first would examine maintenance records, structures and systems.
The second would study flight recorders, operations and meteorology.
The third, a "medical and human factors" group, would look into psychology, pathology and survival.
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