It's been two days since a Malaysia Airlines jumbo jet disappeared from radar, and there's still no indication of what happened to it.
There's been no sign of the plane, and a top Malaysian official says reported sightings of debris haven't panned out.
The Boeing 7-77 was bound from Kuala Lumpur, Malaysia, to Beijing, carrying 239 people (including two Canadians) when it vanished.
Investigators are looking into whether the disappearance has anything to do with two passengers who were flying with stolen passports.
Investigators say no theory has been ruled out, including the possibility of a hijacking or terrorist attack.
Two-thirds of the jet's passengers were Chinese. The rest were from elsewhere in Asia, North America and Europe.
The flight manifest identifies the two Canadians as Xiaomo Bai, 37, and Muktesh Mukherjee, 42. Mukherjee and Bai were married and lived with their two children in Beijing, where Mukherjee was working for Pennsylvania-based Xcoal Energy & Resources, CEO Ernie Thrasher said in an email to The Canadian Press.
Malaysia Airlines has a good safety record, as does the 777, which had not had a fatal crash in its 19-year history until an Asiana Airlines plane crashed last July in San Francisco, killing three passengers, all Chinese teenagers.