On the morning of 21 February, a small group attempted to escape, having been given 4 guns and 3 grenades by a recently appointed prison guard, Hamid Mebarki. After killing 4 prison guards, they began opening cell doors, and the prisoners quickly started a mutiny. They sought to negotiate with the authorities for guarantees of the safety of those prisoners who had not been party to the killing of the guards; the authorities considered negotiation inappropriate, and ordered them back to their cells. At mid-afternoon, the security forces stormed the prison; shooting and grenades continued until about 11 am the next day. Some human rights groups cited claims that the government had executed prisoners after resistance stopped without due process and shot the wounded.