Heavily armed insurgents attacked a British air base in southern Afghanistan Friday, killing two U.S. Marines and wounding several other troops, U.S. officials said.

Prince Harry, third in line to the British throne, is stationed at the base on a four-month combat tour. There was no immediate word on his whereabouts at the time of the attack.

U.S. officials said the attack at Camp Bastion in Afghanistan’s Helmand province involved a range of insurgent weaponry, possibly including mortars, rockets or rocket-propelled grenades, as well as small arms fire.

Lt. Col. Stewart Upton, a spokesman at Camp Leatherneck, a U.S. Marine based adjacent to the air base, confirmed the attack and said two coalition service members had been killed but he did not specify their nationalities.

Upton said coalition forces were assessing the extent of the damage and would provide more details later. . .