Gunfire and an explosion have been heard at the American University in the Afghan capital, Kabul, police say.
Gunmen are believed to have attacked the building and special forces have been deployed. The emergency hospital said they had received five injured people from the scene so far.
Student Ahmad Mukhtar told the BBC that he was 100m (320ft) away from the university’s main entrance when he heard several shots and a big blast.
The explosion created so much light that it momentarily lit up the surrounding area, he said.
Then there were was more firing inside the campus. He added that he also heard students shouting.
Another student told AFP news agency he was stuck inside his class with other students.
“I heard explosions and gunfire is going on close by,” he said by telephone.