At least four suspected militants were killed in a US drone strike on Thursday in the Nazyan district near the Pak-Afghan border.
Intelligence sources said that the drone fired three missiles on militant positions, killing at least four.
A number of others have also reportedly been injured in the strike.
The identity of the militants is yet to be ascertained, but the area is reported to be mostly inhabited by Tehreek-e-Taliban Pakistan (TTP) militants let by Mullah Fazllullah and also some foreign fighters.
According to security officials, militants based in the Nazyan district had planned the devastating attack on the Army Public School in Peshawar, which left over 140 children and teachers dead and scores injured.
Strikes against militants have increased on both sides of the border since the attack.