American University under attack in Kabul

The American University of Afghanistan in Kabul is under assault, as security forces exchange gunfire with the attackers.

The number of students and professors inside are unknown, as is the identity of the attackers.

Massoud Hossaini, a photographer for The Associated Press, tweeted that he is trapped inside.

“Help we are stuck inside AUAF and shooting flollowed [sic] by Explo this maybe my last tweets,” he wrote.

The attackers managed to enter Noor Hospital, adjacent to the school, according to eyewitnesses.

Police spokesman Sediq Sediqqi says police and intelligence agency personnel are at the campus, on the western outskirts of Kabul. He says police believe there is just one assailant.

Two professors at the university — one American and one Australian — were abducted at gun point earlier this month.

ABC News’ Aleem Agha contributed to this report.