"The reports certainly raise questions and concerns and that's exactly why we're looking into them. But right now, it would be premature to speculate. We just don't have the facts yet," the White House Deputy National Security Advisor Tony Blinken told the CNN in an interview.
"Our hearts go out to the people who have lost loved ones in this accident. There were three American citizens onboard. Many Chinese, many Taiwanese. It is too soon to tell what happened, why it happened, but what we've done is this," he said in response to a question.
"The US has made available the FBI, the National Transportation Safety Board, and other experts to aid in the investigation to figure out what happened," he said.
"But right now, it's just too early to tell what the cause was. I've seen these reports about the passports. We're looking into that, but we don't have anything that we can confirm at this point," Blinken said.
The Boeing 777-200 flight of MalaysiaAirlines went missing yesterday over the South China Sea en route to Beijing from Kuala Lumpur. The plane had 227 passengers aboard, including five Indians and one Indian-origin Canadian, and 12 crew members.
Despite two days of massive search, navies from various countries are still struggling to locate the plane which may have crashed.