(CNN) — Seven American service members were among the 11 people killed in a helicopter crash in southern Afghanistan on Thursday, NATO’s International Security Assistance Force said.
Three members of the Afghan National Security Forces and an Afghan civilian interpreter also died in the crash of the UH-60 Black Hawk helicopter.
The cause of the crash is under investigation, the ISAF said.
The helicopter had been on patrol when it went down in the Chinarto area of Shah Wali Kut district in Kandahar province, the Kandahar governor’s office said in a news release.
It is not clear whether the helicopter was in the area because of military operations, the office said.
But military analyst Bill Roggio told CNN he thinks the helicopter could have been involved in a raid, a resupply mission or some sort of special operation because both Afghans and Americans from two different commands were aboard the flight.