Online footage showed students being helped by men in uniforms to crawl through a small hole in the university's perimeter wall.

Amid continuing deadly clashes in Sudan's capital, one of the students was killed at the University of Khartoum after being hit by a stray bullet. A Facebook post by one of his colleagues revealed that the body was buried on campus after safe passage off-site could not be secured.

"We buried our friend after getting permission from his family and the university. We were going to get food for the rest of the students," said law student Mosaab Sharif, who is sheltering in a building near the campus, in an interview with the BBC.

"There were three of us, and then he was hit in the chest. We couldn't even help him. As we were burying our colleague, one of us was hit with a bullet in his hand."

"Snipers have been targeting anyone with flashlights. That's why no one is walking around wearing white clothes to be extra safe," added Sharif. "We are scared of both sides, the military and the Rapid Support Forces, if they shoot in our direction."

Explosions and heavy gunfire continued to rattle the Sudanese capital on Wednesday, the fifth day of fighting, after an internationally brokered truce quickly fell apart. According to a UN toll, the fighting between the army and paramilitaries has killed 300 people, prompting thousands of residents to flee the capital.