U.S. law enforcement agencies respond to airstrikes, multiple departments collaborate to investigate domestic threats.

On June 22, Jin10 reported that after the U.S. launched airstrikes against Iran on Saturday, law enforcement agencies across the country are closely following the situation in the Middle East, tracking intelligence to assess any potential threats to the U.S. homeland. A federal official familiar with the coordination efforts told CNN that the Department of Homeland Security (DHS), the Federal Bureau of Investigation (FBI), and other federal, state, and local agencies are all on alert for any responses from Iran or elsewhere targeting the U.S. Homeland Security Secretary Mayorkas stated, "We will do everything possible to protect the security of the U.S. homeland." The police departments of New York City and Washington, D.C. said they are sharing intelligence with federal partners and are increasing or maintaining a significant police presence around religious institutions. Since the outbreak of conflict between Israel and Iran earlier this month, security levels have been elevated in several key areas of the nation's capital, including the White House, the Pentagon, and the Israeli embassy. Officials revealed to CNN that such security upgrades are part of routine safety procedures that are activated in the event of conflicts of this scale.