Security forces have killed two gunmen and rescued 500 students after terrorists attacked the American University of Afghanistan in Kabul.

Afghan policemen stand guard at the attack site in Kabul, capital of Afghanistan, Aug. 24, 2016. At least one student was killed and nearly 20 persons injured after a car bombing and ensuing gunshots rocked a private college in the Afghan capital of Kabul on Wednesday evening, sources said. (Xinhua/Rahmat Alizadah)

A car bombing and gunshots rocked the private college on Wednesday evening. One security guard was killed and more than 20 others were wounded. No group has claimed responsibility for the attack yet.

An ambulance transfer injured people at the attack site, in Kabul, Afghanistan, Aug. 24, 2016. Casualties were feared as an explosion ripped through a busy road in western part of Afghan capital of Kabul on Wednesday, a witness said. (Xinhua/Jawid Omid)

Terrified students recounted barricading themselves in classrooms and jumping from the second floor to escape. 

“We were studying at the second floor, suddenly we heard a very harsh sound, there some gunfire. We didn’t feel safe, so we jumped from the second floor and escaped from the gateway. From there, the police officers took us here. I saw five or six persons jump from the second floor. I don’t remember what happened to them. Just because we escaped, I haven’t seen anything,” said Ziaullah, student.

“She was telling me that, ‘Please pray for me, because maybe this is the last time that I talk to you.’ There were a lot of people, from teachers, students, male and female, they were inside. She told me that we all barricaded with tables and chairs on the back of the door in order to keep themselves safe,” said Mohammed Ali, brother of a student.