Islamic State in Afghanistan aims to attack US, general says

The Islamic State group in Afghanistan is a "very worrisome" threat to the United States, and US counterterrorism efforts have yet to shrink its extremist ambitions, a senior American general has said.

Marine Gen. Frank McKenzie said IS would be hard pressed, however, to carry out an attack on the U.S. homeland because it is under strong military pressure.

"ISIS in Afghanistan certainly has aspirations to attack the United States," McKenzie said. "It is our clear judgment that as long as we maintain pressure on them it will be hard for them to do that."