The Department of Homeland Security is warning of a "heightened threat environment" across the United States in response to its attack on Iran over the weekend.

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

Iran's military launched dozens of missiles into Israel on Saturday night after President Donald Trump ordered U.S. airstrikes against three Iranian nuclear sites at Fordow, Natanz and Isfahan. Trump and other world leaders have called on Iran to come to the negotiating table.

It was an unprecedented attack years in the making, with some last-minute misdirection meant to give the operation a powerful element of surprise