For more than three days, students at the University of Khartoum have been trapped inside campus buildings as artillery and gunfire rains down around them in Sudan's capital.

South African prosecutors have dropped a murder charge against Zolile Sekeleni, the father of the girlfriend of high-profile convicted murderer Thabo Bester, who is accused of escaping from a South African prison after faking his own death in a fire, officials told CNN Monday.

Sudan's paramilitary forces besieged and shelled a hospital in central Khartoum on Sunday, five eyewitnesses told CNN, as fighting between militants and the country's military claimed nearly 100 lives over the weekend.