U.S. President Donald Trump talks with reporters before boarding Air Force One at John F. Kennedy International Airport in New York, early Tuesday, June 9. AP-Yonhap

DUBAI, United Arab Emirates — The U.S. military said Tuesday it has begun strikes against Iran following the crash of a U.S. Army Apache helicopter off the coast of Oman that U.S. President Donald Trump blamed on the Islamic Republic.

In a statement posted to social media, U.S. Central Command said the strikes would be “a proportional response to unjustified Iranian aggression.” It comes after Trump blamed Iran for downing the helicopter and vowed that the U.S. would respond.

Iranian state media reported that explosions were heard on an Iranian island in the Strait of Hormuz.

Trump had blamed Iran for shooting down a helicopter close to the Strait of Hormuz and said the United States must respond. Iran's top diplomat said foreign military forces near the country's territory “are at constant risk.”