Eleven suspected militants allegedly attempting to enter Pakistan from Afghanistan were killed in a clash with security officials in Kurram Agency on Sunday.

The militants who tried to enter Pakistan via Khyber Agency were surrounded by security forces and an exchange of fire ensued, security officials said.

Two security personnel were also killed in the exchange of fire.

Five more militants were killed in an operation by Counter Terrorism Department in Layyah, Punjab, Radio Pakistan reported.

In another instance, according to the state news agency, a "most wanted terrorist" was killed on New Saryab Road in Quetta.

The 'encounter' comes as Pakistani authorities issued shoot-on-sight orders for those attempting to cross the Pak-Afghan border illegally.

Security forces have launched nationwide intelligence operations as Pakistan seems to be experiencing a fresh resurgence in terror attacks.

Eighty eight people were killed and hundreds were injured when a bomb ripped through the shrine of Lal Shahbaz Qalandar in Sehwan on Thursday ─ the deadliest amongst a series of attacks carried out by militants in recent weeks.

Military leadership claimed the attacks were carried out by militants operating from safe-havens in Afghanistan and the Pak-Afghan border was sealed at the crossings at Torkham and Chaman as part of tightening security in the wake of the attack on the shrine, indefinitely.