One soldier with the NATO-led coalition force was killed Tuesday in an explosion in a military camp in restive southern Afghanistan, the coalition confirmed in a statement. \"An International Security Assistance Force (ISAF) service member died as a result of an explosion in an ISAF camp in southern Afghanistan today,\" the ISAF said in the statement. The brief statement did not disclose the nationality of the victim and details about the incident, only saying \"the cause of the explosion is unknown, however, there is no current indication that the explosion was a result of enemy activity. ISAF officials are investigating the incident.\" A total of 50 countries are contributing to the 100,000-strong force in Afghanistan with over 68,000 of them American mainly stationed in the east and south, followed by 9,500 from UK mainly based in southern Afghanistan. A total of 379 foreign soldiers, most of them Americans, have been killed in Afghanistan so far in 2012.