United State has said that the attacks on US soldiers increased after the killing of Osama Bin Laden.
Most of the attacks were conducted by the militants crossing boarder from Pakistan.
The spokesman of Pentagon said that attacks increased on the US soldiers deployed near Pak-Afghan boarder.
He said that attacks increased after May and June and some time the rockets fired from inside Afghanistan, adding that it is not clear yet who is conducting these attacks.
October 19, 2011