Three International Security Assistance Force service members were killed Monday when insurgents attacked their position, the NATO-led ISAF said.
The attack in southern Afghanistan involved a vehicle-borne improvised explosive device, said ISAF.
The nationalities of the service members were not immediately known.
According to Omar Zwak, spokesman for the governor of Helmand province, four armed insurgents, including a suicide bomber, approached the entrance gate of a military outpost in the Musa Qala district of Helmand province.
The outpost belongs to troops from the nation of Georgia.
Three insurgents got out of a car before the bomber detonated explosives, Zwak said.
The three remaining insurgents then engaged in a firefight with troops, resulting in the insurgents' deaths, he said.
Zwak said that one civilian was also killed.
Qari Yousuf Ahmadi, a spokesman for the Taliban, claimed responsibility for the attack.
In a separate attack Monday, 10 civilians, including women and children, were killed and a dozen others wounded when a roadside bomb exploded in southern Kandahar province, according to the office of Afghan President Hamid Karzai.