KUALA LUMPUR, Malaysia (AP) - The FBI joined forces with Malaysian authorities in analyzing deleted data on a flight simulator belonging to the pilot of the missing Malaysia Airlines plane, while distraught relatives of the passengers unleashed their anger Wednesday - wailing in frustration at 12 days of uncertainty.
The anguish of relatives of the 239 people on Flight 370 boiled over at a briefing near Kuala Lumpur's airport. Two Chinese women who shouted at Malaysian authorities and unfurled a banner accusing officials of "hiding the truth" were removed from the room. In a heart-wrenching scene, one woman screamed in sorrow as she was dragged away.
Files containing records of flight simulations were deleted Feb. 3 from the device found in the home of the Malaysia Airlines pilot, Capt. Zaharie Ahmad Shah, Malaysian police chief Khalid Abu said.
It was not immediately clear whether investigators thought that deleting the files was unusual. The files might hold signs of unusual flight paths that could help explain where the missing plane went.
Defense Minister Hishammuddin Hussein told a news conference that Zaharie is considered innocent until proven guilty. He said members of the pilot's family are cooperating in the investigation.
A U.S. official said the FBI has been given electronic data to analyze.
U.S. Attorney General Eric Holder said in Washington that the FBI was working with Malaysian authorities.
Flight 370 disappeared March 8 on a night flight from Kuala Lumpur to Beijing. Malaysian authorities have not ruled out any possible explanations, but have said the evidence so far suggests the flight was deliberately turned back across Malaysia to the Strait of Malacca, with its communications systems disabled. They are unsure what happened next and why.
Investigators have identified two giant arcs of territory spanning the possible positions of the plane about 7Â½ hours after takeoff, based on its last faint signal to a satellite - an hourly "handshake" signal that continues even when communications are switched off. The arcs stretch up as far as Kazakhstan in central Asia and down deep into the southern Indian Ocean.
Police are considering the possibility of hijacking, sabotage, terrorism or issues related to the mental health of the pilots or anyone else on board, and have asked for background checks from abroad on all foreign passengers.
Hishammuddin said such checks have been received for all the foreigners except those from Ukraine and Russia - which account for three passengers. "So far, no information of significance on any passengers has been found," he said.
The 53-year-old pilot joined Malaysia Airlines in 1981 and had more than 18,000 hours of flight experience. People who knew Zaharie from his involvement in opposition political circles in Malaysia and other areas of his life have described him as sociable, humble, caring and dedicated to his job.
The crisis has exposed the lack of a failsafe way of tracking modern passenger planes on which data transmission systems and transponders - which make them visible to civilian radar - have been severed. At enormous cost, 26 countries are helping Malaysia look for the plane.