At least ten people have been killed in an attack by gunmen at a university in Pakistan, according to reports.

Four of the attackers have been killed but others are believed to still be in the campus building in Khyber Pakhtunkhwa province, in the country's northwest, Sky News reported.

Explosions have been heard inside the building and a major police operation is under way to tackle those responsible.

Militants used the cover of thick, wintry fog to scale the walls of the Bacha Khan University in the town of Charsadda, about 22 miles (30km) from the city of Peshawar.

They then went into university buildings and began to open fire on teachers and students in classrooms.

The university teaches over 3,000 students and was hosting an extra 600 visitors on Wednesday for a poetry recital, according to its vice chancellor Fazal Rahim.

Source: MENA