Officials believe this is a new strategy from ISIS to organize attacks on nations in airstrike coalition . The U.S. has been bombing ISIS-held territory for more than two years and the group continues to hold territory. Neither the CIA nor Greek officials were able to locate the man . U.S. sources tell CNN that they knew of planned attacks and shared information with Belgians .
Officials believe this is a new strategy from ISIS to organize attacks on nations in airstrike coalition . The U.S. has been bombing ISIS-held territory for more than two years and the group continues to hold territory. U.S. sources tell CNN that they knew of planned attacks and shared information with Belgians .