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.

"I want you to help me to find my son! I want to see my son!" one of the two unidentified women said. "We have been here for 10 days."

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.