Homeland Security warns of possible terrorist attacks in US following strike on Iran

The Department of Homeland Security issued a terrorism alert on Sunday — warning of possible Iranian attacks against the US following the American airstrikes against Tehran’s nuclear program. 

DHS warned officials to be on the lookout for Iranian-led attacks over the next three months by terror cells inspired to retaliate following Saturday night’s strike. 

“The likelihood of violent extremists in the Homeland independently mobilizing to violence in response to the conflict would likely increase if Iranian leadership issued a religious ruling calling for retaliatory violence against targets in the Homeland,” DHS said in a statement. 

Iranians at a rally in Tehran after the US airstrikes on three of the countries nuclear facilities on June 22, 2025. via REUTERS

A bulletin issued by the US Department of Homeland Security National Terrorism Advisory System Sunday, June 22, 2025. DHS

Along with the possibility of extremist attacks on US soil, officials warned that the chances of both cyberattacks and antisemitic acts are likely to increase.

The advisory comes after the NYPD put out its own alert last night, with Gov. Hochul upping security at the MTA and Port Authority.