Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) –Today's massacre of defenseless school children in Peshawar was carried out by the Pakistani Taliban in retaliation, the group says, for the killing of hundreds of innocent tribesman in north and south Waziristan by the Pakistani military.
CNN's chief national security correspondent Jim Sciutto looks into the group and the threat they might also pose to the United States.