Kandahar: A helicopter belonging to international forces in Afghanistan has gone down in the country's southeast.

A spokesman for the Taliban said its forces had shot it down, although an Afghan official said it appeared to have crashed due to mechanical failure, causing four deaths.

A Nato spokesman said only that the helicopter went down Friday in the southeastern province of Zabul, and that no other details were known about the incident, which was under investigation.

A Zabul government spokesman, Mohhamed Jahn Rasuliyar, first said the helicopter appeared to have been shot down, but changed that later to say the cause appeared to have been technical failure.

He said the crash site was about 7 miles from the provincial capital of Qalat, further away than originally reported.