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(CNN) – New information indicates missing Malaysia Airlines Flight 370 could have flown for several hours beyond the last transponder reading, U.S. officials tell CNN.
Multiple bursts of data were received indicating the plane was flying over the Indian Ocean, the senior U.S. official told CNN.
But there's another confusing twist. An emergency beacon that would have sent data if the plane was about to impact the ocean apparently did not go off, the official said, suggesting perhaps the plane was still likely in some stable flight pattern when it disappeared.
To former FBI assistant director James Kallstrom, the new, conflicting data is starting to look suspicious.
"Why would you take a plane off your normal route, shut off your transponders so that every other radar return looks about the same to a radar interceptor officer ... and then lower your altitudes apparently and fly somewhere else? Why would you do that with a plane full of people?" said Kallstrom.
Investigators "without question" should revisit terrorism as a possible explanation, says Kallstrom.
For more of our interview with former FBI official James Kallstrom, check out the video above.