Military radar suggests the missing Boeing 777 jet may have turned back before disappearing over the South China Sea, Malaysia's air force chief said Sunday.
Rodzali Daud told a press conference that "there is a possible indication that the aircraft made a turnback," adding that authorities were "trying to make sense of that."
Investigators were also checking surveillance footage of two passengers they believe boarded the Malaysia Airlines jet using stolen passports. Two names on the passenger manifest of the plane matched passports reported stolen in Thailand, one belonging to an Italian and the other to an Austrian. The passports' legitimate owners were not on the aircraft.
U.S. officials told NBC News on Saturday they were investigating terrorism concerns after the red-eye flight from Kuala Lumpur, Malaysia, to Beijing vanished in relatively clear weather, without sending a distress signal, at what analysts said would have been cruising altitude.
"We are aware of the reporting on the two stolen passports," one senior U.S. official said. "We have not determined a nexus to terrorism yet, although it's still very early, and that's by no means definitive."