American University Under Attack in Kabul, Afghanistan

The American University of Afghanistan in Kabul is under attack.

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.

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