A Syria war monitor reported on Saturday that more than 300 civilians from the Alawite minority have been killed in recent days by security forces and their allies, as authorities clash with militants loyal to the former government of Bashar al-Assad. Restoring security has been one of the most complex tasks for Syria’s new authorities, installed after forces ousted Assad — himself an Alawite — in a lightning offensive in December. They are now facing their fiercest attacks yet by members of the Assad clan’s Alawite minority and have launched a major counter-operation in the ethnic group’s Mediterranean heartland. Deadly clashes on Thursday triggered the security operation, after previous tensions in the area. The Syrian Observatory for Human Rights reported on Saturday that “340 Alawite civilians were killed in the coastal regions of Syria and the Latakia mountains by security forces and allied groups” since then. The Observatory indicated they were killed in “executions” car...