QUETTA: Two teachers and a student were injured Saturday when suspected militants hurled a hand grenade at a girls' school in insurgency-hit southwestern Pakistan, police said.

The militants lobbed the grenade at a state-run junior school in Quetta, the capital of oil- and gas-rich Balochistan province, which borders Iran and Afghanistan, senior police officer Khalid Manzoor said.

The grenade blew off the staff room's roof and splinters hit two female teachers and an eight-year-old student, he said.

‘The teachers had wounds to their heads but both are out of danger in the hospital,’ Manzoor said, adding that the student had only minor injuries.

No one claimed responsibility for the attack.

Grenade and bomb explosions and drive-by shootings are fairly frequent in impoverished Balochistan province, which is gripped by an insurgency.

Hundreds of people have died since Baloch militants rose up against the central government in 2004, demanding autonomy and a greater share of the profits from the region's natural resources.