MAZRAA, Syria — Syria’s armed Bedouin clans announced Sunday that they had withdrawn from the Druze-majority city of Sweida after weeklong clashes and a U.S.-brokered ceasefire, as humanitarian aid convoys started to enter the battered southern city.

The clashes between militias of the Druze religious minority and the Sunni Muslim clans killed hundreds and threatened to unravel Syria’s fragile postwar transition. Israel also launched dozens of airstrikes in the Druze-majority Sweida province, targeting government forces who had essentially sided with the Bedouins.

The fighting also led to targeted sectarian attacks against the Druze community, followed by revenge attacks against the Bedouins.

A series of tit-for-tat kidnappings sparked the violence in various towns and villages in the

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