The UN said 74 per cent of the casualties were caused by insurgents, nine per cent by pro-government forces and 12 per cent as a result of ground fighting between the two sides.
The remaining four or five per cent of civilian casualties were unattributed, caused mainly by explosive remnants of war, it added.
Insurgent bomb attacks remain the highest cause of civilian casualties, but increased ground fighting between Afghan troops and insurgents was the second leading cause.
"Despite Afghan forces leading almost all military operations countrywide, a permanent structure does not exist in relevant ANSF (Afghan security force) bodies to systematically investigate allegations of civilian casualties, initiate remedial measures and take follow-up action," the report warned.
- AFP