The United States on Tuesday launched strikes against Iran after President Donald Trump said Tehran had shot down a U.S. Apache helicopter in the Strait of Hormuz, deepening doubts about prospects for peace between the two countries.

“The mission is a proportional response to unjustified Iranian aggression,” the U.S. military said on X.

Trump earlier said the two U.S. pilots involved in the incident were uninjured but that the United States would respond to the attack.

The Apache was brought down by a one-way Iranian attack drone, according to a U.S. official who spoke on condition of anonymity.

Iran’s Foreign Minister Abbas Araghchi did not directly address the incident, but said foreign forces in the region risked being involved in accidents or crossfire.

“To reduce risk, best solution is for them to leave,” he said on social media.