U.S. hints at more strikes unless Iran-linked groups halt attacks

U.S. Defense Secretary Lloyd Austin on Monday left open the possibility of more strikes against Iran-linked groups if attacks against American forces in Iraq and Syria don't stop, hours after overnight U.S. air strikes in Syria.

"These attacks must stop, and if they don't stop, then we won't hesitate to do what's necessary, again, to protect the troops," Austin told reporters at a news conference in Seoul.