Pakistan's military said Afghan and U.S. forces have failed to take action against a Taliban cleric responsible for a spate of crossborder raids, despite repeated requests from Islamabad.
The military say raids in which militants loyal to Maulvi Fazlullah took part have left about 100 members of Pakistan's security forces dead.
Fazlullah was the Pakistani Taliban leader in Swat Valley, northwest of Islamabad, before a 2009 army offensive forced him to flee.
Pakistani Army spokesman Major General Athar Abbas told Reuters that "the problem refuses to go away," adding that Fazlullah and his group were now "trying to reenter Swat" through the northwestern border region of Dir.
Pakistan is currently facing increased U.S. pressure to attack Afghan militant groups who cross the border to attack Western forces in Afghanistan.