The Syrian Observatory for Human Rights, a U.K.-based war monitor, said the clashes started after members of a Bedouin tribe in Sweida province set up a checkpoint where they attacked and robbed a Druze man, leading to tit-for-tat attacks and kidnappings between the tribes and Druze armed groups.

Israel says it is intervening to protect Syria’s Druze residents who have strong ties to Israel’s Druze community. Damascus called the attack a violation of sovereignty.

Syria’s defense minister has announced a ceasefire after government forces entered a key city in Sweida province on Tuesday.

Israel struck Syria’s military headquarters in Damascus on Wednesday and moved more troops to the border area in a bid, officials said, to prevent attacks against the Syrian Druze community.