Four Americans and a Briton were killed in southern Afghanistan on Wednesday, military officials said.

The four U.S. service members were killed when their helicopter was downed by hostile fire in Helmand province, said International Security Assistance Force spokesman Lt. Col. Joseph T. Breasseale.

The British soldier was killed in an explosion, also in Helmand province, the British Ministry of Defence said.

June is turning into a deadly month for international forces in Afghanistan — 29 service members, including 15 Americans, have been killed.