Afghanistan : Three out of four American casualties are caused by insurgents . More than 2,400 civilians are killed and more than 3,800 injured this day . The US and its allies are killing fewer , but insurgents are killing more .
NEW : Three out of four civilians casualties are caused by insurgents . More than 2,400 civilians are killed and more than 3,800 injured this year . The U.S. and its allies are killing fewer , but insurgents are killing more .