The Department of Homeland Security issued an advisory June 22 warning Americans cyber attacks are likely, and violence in the homeland is possible.

The United States Department of Homeland Security (DHS) issued a threat summary in a National Terrorism Advisory System Bulletin Sunday following Saturday's strikes on three key-nuclear facilities in Iran. "The ongoing Iran conflict is causing a heightened threat environment in the United States," the DHS statement said.

A bulletin from the National Terrorism Advisory System warns of a "heightened threat environment" in the U.S. following the military strikes on Iran's nuclear sites.