Pakistani officials say at least 15 suspected militants were killed on Tuesday as military jets pounded targets in a northwestern tribal region bordering Afghanistan.
Tuesday's airstrikes in North Waziristan raised the three-day death toll from a new military offensive in the region to at least 187.
On Sunday, the army announced it had launched a "comprehensive operation" against militants in North Waziristan.
The announcement came a week after a militant attack on an airport in Karachi left nearly 40 people dead, including 10 assailants.
The Pakistani Taliban and militants from the central Asian state of Uzbekistan claimed responsibility for the raid.
On Monday, Prime Minister Nawaz Sharif urged Afghan President Hamid Karzai to help seal the border in the region to cut off a flow of suspected militants into Afghanistan.
In another development, General Joseph Dunford, the top U.S. military commander in Afghanistan, told the Associated Press the U.S. had increased its surveillance along the Afghan-Pakistan border as a result of the Pakistani offensive.
Pakistani army chief General Raheel Sharif said Monday that the operation is aimed at eliminating "all terrorists and their sanctuaries" in North Waziristan and that he hopes to "get rid of the menace of terrorism."