Five soldiers with the NATO-led International Security Assistance Force (ISAF) troops were killed in south Afghanistan on Thursday, a statement released by the alliance here said. "Five International Security Assistance Force service members died following an improvised explosive device attack in southern Afghanistan today," the statement added. However, it did not identify the nationalities of the victims, saying it is ISAF policy to defer casualty identification procedures to the relevant national authorities. Troops mostly from the United States, Britain, Canada and Australia have been serving in the southern provinces where Taliban militants are active. More than 380 NATO soldiers with majority of them Americans have been killed since the beginning of this year in the militancy- plagued Afghanistan.