Two foreign soldiers have been killed in a bomb attack in southern Afghanistan, NATO said Monday, although neither was involved in a major military operation in the area. In a brief statement, NATO's International Security Assistance Force (ISAF) said the two soldiers died on Sunday. "Two ISAF service members were killed in an IED (improvised explosive device) strike yesterday in southern Afghanistan," it said. "Neither casualty is related to Operation Mushtarak," it said, referring to the 15-000-strong assault on the Marjah and Nad Ali areas of Helmand province. Their nationalities were not revealed, in line with ISAF policy. At least 93 foreign soldiers have died in Afghanistan since the beginning of this year, most of them in IED attacks, according to an AFP count based on that kept by the website.