U.S. Troops Monitor Volatile Afghan Border
The border between Afghanistan and Pakistan is at the center of controversy. Last week, NATO forces on the Afghan side fired across at what they thought were insurgents, and killed two dozen Pakistani soldiers. Officials are investigating.
Source: http://www.npr.org/2011/12/02/143039969/u-s-troops-monitor-volatile-afghan-province?ft=1&f=1004