( CNN ) -- Four tribesmen from Arab Rizeigat tribe reportedly killed in clashes Sunday . Fighting part of an outbreak of violence over the weekend that killed as many as 54 . The fighting is a sign of growing tensions between tribes and government officials who have been trying to quell unrest since last month's ouster of longtime ruler Hosni Mubarak.
Four tribesmen from Arab Rizeigat tribe reportedly killed in clashes Sunday . Fighting part of an outbreak of violence over the weekend that killed as many as 54 . The fighting is a sign of growing tensions between tribes and government officials who have been trying to quell unrest since last month's ouster of longtime ruler Hosni Mubarak.