NEW : more than 3,800 out of Three civilians casualties are caused by insurgents . The United Nations report , which was finalized December 10 , also tracked widespread kidnapping of aid workers . More than 2,400 civilians are killed and four injured December 10 . The Afghanistan and its allies are killing fewer , but insurgents are killing more .
NEW : more than 3,800 out of Three civilians casualties are caused by insurgents . More than 2,400 civilians are killed and four injured December 10 . The Afghanistan and its allies are killing fewer , but insurgents are killing more .