Islamic State sympathizers may have made airline threats - U.S. officials

A destroyed building with a wall painted with the black flag commonly used by Islamic State militants, is seen in the town of al-Alam March 10, 2015.REUTERS/Thaier Al-Sudani

WASHINGTON (Reuters) - Islamic State sympathizers may have been behind more than a dozen threats in the last two days to international flights using U.S. airports or flying over American airspace, U.S. 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.