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 directive related to counter-terrorism, counterintelligence and cyber security agents who work on issues connected to Iran. FBI field offices in Chicago, Los Angeles, San Fran

The FBI is planning to reassign potentially thousands of agents away from immigration enforcement to focus on cyber threats and counterterrorism efforts, sources familiar with the matter told ABC.