A Chinese ship searching for the missing Malaysia Airlines plane in the southern Indian Ocean has picked up a pulse signal, Chinese media say.
They say the signal has a frequency of 37.5kHz per second - the same as those emitted by the flight recorders.
However, there is no evidence so far that it is linked to MH370.
Dozens of ships and planes have joined the search, with the operation moving into its most intensive phase before batteries on the data recorders fade.
The Chinese search ship Haixun 01 on Saturday picked up the signal at about 25 degrees south latitude and 101 degrees east longitude, the state-run Xinhua news agency said.
"It is yet to be established whether it is related to the missing jet," it cautioned.
Also, a report says Chinese air force plane in search for MH370 spotted a number of white floating objects in Southern Indian Ocean on Saturday.
The flight is believed to have crashed in the southern Indian Ocean, although no confirmed debris has been found.
It is still not known why the plane diverted from its planned flight path from Kuala Lumpur to Beijing four weeks ago with 239 people on board.
Up to 10 military planes, three civilian jets and 11 ships are scouring a 88,000-sq-mile patch of desolate ocean northwest of Perth near where investigators believe the plane went down on March 8 with the loss of all 239 passengers and crew on board.