In pictures: Pakistan attacks

Wreckage of a bus destroyed in a university bomb blast in Quetta, Pakistan, 15 June

Gunmen have attacked a bus at a university in the western Pakistani city of Quetta, killing several students.

Wreckage of a bus destroyed in a university bomb blast in Quetta, Pakistan, 15 June

The bus was carrying female students as they were going home. Sunni militant group Laskar-e-Jhangvi claimed the attack.

Pakistani police and volunteers gather at the wreckage of a bus destroyed in a bomb blast in Quetta, Pakistan, 15 June

About 20 wounded students were taken to a local hospital, which was itself attacked by gunmen as the victims were being treated.

A Pakistani firefighter extinguishes a fire which gutted a historical building in Ziarat, south-east of Quetta, 15 June

Quetta is the capital of Balochistan province, which has seen a surge in violence. Hours before the Quetta violence, a historic house in the mountain resort of Ziarat was destroyed by militants.

Pakistani troops at the scene of a blaze which gutted a historical building in Ziarat, south-east of Quetta, on 15 June

Security forces in Balochistan have been battling both separatist insurgents and Sunni Islamist extremists.