From Bloomberg:

Hundreds of terrorists will fan out to infiltrate western Europe and the U.S. to carry out attacks on a wider scale as Islamic State is defeated in Syria, FBI Director James Comey warned.

“At some point there’s going to be a terrorist diaspora out of Syria like we’ve never seen before,” Comey said Wednesday in New York. “We saw the future of this threat in Brussels and Paris,” said the head of the Federal Bureau of Investigation, adding that future attacks will be on “an order of magnitude greater.”