WASHINGTON - Islamic State sympathizers may have been behind more than a dozen threats in the last two days to international flights using US airports or flying over American airspace, US law enforcement and security officials said on Wednesday.
However, one official said the FBI has not identified who was behind the threats and does not have evidence pointing directly at militants.The officials said that after 11 threats were received by US law enforcement officers on Monday, at least four more were phoned in late on Tuesday.
The threats were all similar and the caller claimed the flights were carrying some form of chemical weapons, the officials said, adding that some investigators' leading theory was that sympathizers of Islamic State were responsible.
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