The Jamatul Ahrar suicide bomber targeted members of a local peace committee during Friday prayers.
Police constable Junaid Khan, 24, sacrificed his life to save countless others from a terrorist attack in Mardan District.
The operation will help curb militancy, officials say.
Health workers vow to continue administering the oral polio vaccine despite ongoing threats from militants.
Jamatul Ahrar claimed responsibility for the attack which killed at least 28 people during Friday prayers.
Most tribal areas have been cleared of militants, researchers say.
Pakistan has no space for ISIL, officials and security analysts say.
The Iran-backed group's fighting alongside the Syrian regime has drawn terrorist groups and other actors to Lebanon.
The new force, comprised of Iranian and foreign fighters, will fan sectarian tensions in the region and exacerbate rifts in Arab society, clerics say.
The on-going operation will prove decisive, analysts say.