Four days of clashes between pro-government gunmen and members of a minority sect in Syria have left nearly 100 people dead and raised fears of deadly sectarian violence.

The sectarian violence involving Islamist factions, security forces and Druze gunmen is another sign of the fragile security situation.

Israel said it carried out a strike in Syria against "an extremist group" that attacked members of the Druze community, following through on a promise to defend the minority group as deadly sectarian violence spread near Damascus on Wednesday.