The United States military launched another round of strikes against Iran for the second consecutive day late Wednesday night into Thursday morning. The military operation was described as “self-defense strikes” and came after failed efforts to agree to a peace deal and after Iran shot down a U.S. Apache helicopter. Renewed military strikes have bombarded the Middle East in recent days, with the U.S. and Iran launching tit-for-tat strikes against each other.

“U.S. Central Command (CENTCOM) forces completed additional self-defense strikes against multiple targets in Iran, June 10, at the Commander in Chief’s direction,” read a social media post by U.S. Central Command.

U.S. strikes targeted Iranian defense sites, communication technology systems, and military surveillance capabilities, according to U.S. Central Command. The strikes come after President Donald Trump warned of further retaliation against Iran and that the country would “pay the price” for its recent military strikes against U.S. allies in the Middle East and “stalled negotiations” in an anticipated peace deal.

“U.S. Marine Corps, Air Force, and Navy assets fired precision munitions on Iranian targets that posed a threat to U.S. forces and international commercial ships transiting regional waters,” CENTCOM said. “The strikes are in response to Iran’s unwarranted and continued aggression. U.S. forces remain vigilant, lethal, and ready.”