Officials in Pakistan say militants wearing police uniforms have attacked the office of a senior government official in the northwestern city of Peshawar, killing at least four people.
There was no immediate claim of responsibility for the attack Monday, but the Pakistani Taliban have carried out similar operations in the past.
Elsewhere in Pakistan Monday, Shi'ites in Quetta have refused to bury victims of a bloody bombing that killed at least 80 people and wounded more that 100 others. They have demanded that security forces protect them from the extremists behind the attack.
Up to 4,000 people have joined in the protest. Muslim tradition requires that bodies are buried as soon as possible and leaving them above ground is a powerful expression of grief and pain.
The Sunni militant group Lashkar-e-Jhangvi has claimed responsibility for Saturday's bombing, as well as a similar attack last month that killed more nearly 100.
Meanwhile, a strike Monday to protest against the bombing in Quetta has brought Pakistan's largest city, Karachi, to a standstill.
Sectarian violence claimed more than 400 lives in Pakistan last year.