There is no specific threat but in recent days, the FBI and Department of Homeland Security (DHS) have spoken with governors and law enforcement agencies across the country about the heightened threat environment.

The FBI has ramped up its efforts to monitor potential threats to the U.S. from Iran following President Donald Trump’s decision to attack the country’s nuclear facilities, two people briefed on the matter told Reuters on Tuesday.

The FBI is returning national security agents who were ordered to focus on immigration cases back to their old jobs due to concern about potential threats from Iran