The FBI is aiding the Malaysian government's search for a Malaysia Airlines jet missing for more than a week.
美国联邦调查局正协助马来西亚政府寻找失联的马来西亚航班。
The US investigators are believed to be helping the Malaysians examine a home flight simulator belonging to one of the pilots of flight MH370 for clues.
The pilot is said to have deleted some files from the computer simulator.
Teams from 26 countries are trying to find flight MH370, which went missing on 8 March with 239 people on board.
The flight was flying from Kuala Lumpur to Beijing.
US-Malaysia co-operation
The FBI, through its legal office in Kuala Lumpur, "continues to engage with appropriate Malaysian authorities and provide support where necessary to the Malaysian government in their investigation of the missing aircraft", according to a statement issued on Wednesday.
The agency would not comment on the specifics of its investigation, nor what had been communicated to its investigators by Malaysian authorities.
On Wednesday, US President Barack Obama said "we have put every resource that we have available at the disposal of the search process".
Speaking to a Fox News affiliate, the US leader said there had been "close cooperation" with the Malaysian government, and "anybody who typically deals with anything related to our aviation system is available".
Earlier, White House spokesman Jay Carney said Malaysia was also speaking to US aviation and transport accident investigation agencies.
"We are finding that the level of co-operation with the Malaysian government is solid, and we are working closely with the Malaysians as well as our other international partners in this effort to find out what happened to the plane and why it happened," he said.
A US law enforcement official told the Reuters news agency the Malaysian officials gave the FBI access to data generated by both pilots including from a hard drive attached to the captain's flight simulator and electronic media used by a co-pilot.
