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

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 Federal Bureau of Investigation is moving resources off immigration cases and back to counterterrorism, citing potential threats after the US launched airstrikes on Iranian nuclear sites and helped broker a ceasefire between Iran and Israel following nearly two weeks of fighting.