The Taliban have claimed responsibility for an attack in which at least 19 people died at a university in Pakistan.
Four of the attackers are known to have been killed at the campus building in Khyber Pakhtunkhwa province, in the country's northwest.
Militants used the cover of thick, wintry fog to scale the walls of the Bacha Khan University in the town of Charsadda, about 18 miles (30km) from the city of Peshawar.
They then went into university buildings and began to open fire on teachers and students in classrooms.
Explosions were heard inside and TV pictures showed heavily armed security personnel heading into the compounds as female students ran for their lives.
At the university gates, distraught relatives of those being taught inside anxiously waited for news.
It is not known if the 19 included the four dead attackers, but at least one lecturer is among those who lost their lives, foreign media reports.