The US has put every asset it has to help Malaysian authorities try and get to the facts, Deputy National Security Advisor Tony Blinken said.
"We're chasing down every theory. We're looking at the facts as they develop. But again, the bottom line is we can't get ahead of the facts," Blinken told the CNN.
Officials of the Federal Bureau of Investigation and the National Transportation safety Board are helping Malaysian authorities in the investigation; while the Pentagon has deployed its assets in the Indian Ocean, including a P-8 Poseidon surveillance plane, trying to find out what happened.
"And this is something that we're on every day in cooperation with Malaysians and with many other countries in the region."
"There is no prevailing theory," he said in response to a question.
"I would say, if there's anything encouraging to a tragic incident like this, is you have countries working together in ways that they haven't before -- not just the Malaysians, but we have the South Koreans, the Chinese, the Australians, New Zealand, the US, Canada, all working in the same direction, which is to get to the bottom of what happened," Blinken said.
The Beijing-bound Boeing 777-200 was carrying 239 people, including five Indians and an Indo-Canadian.
Meanwhile, Alan Diehl, former NTSB investigator told the Fox News that more search airplanes must be deployed in the region to find the plane.
"Obviously, there's a lot of debris out there, and we need a lot more resource than eight airplanes and 20-something ships. I think we need 48 airplanes and we need it quick. And I just hope that President (Barack) Obama is getting the right kind of information," he said.
"This is probably going to be a very long search, unless we just luck out and one of these P-3s or P-8s hears the pinger and we localise it quickly," he said.
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