A militant rocket attack in eastern Syria on Friday targeted a bus with oil industry employees, killing at least 10, the government said. To the north, Syrian Kurdish-led forces announced they arrested 52 militants in an operation against the Islamic State group's sleeper cells.

According to Syria's petroleum ministry, the rocket struck in the Al-Taym gas field in eastern Deir el-Zour province. There was no immediate claim of responsibility but the Britain-based Syrian Observatory for Human Rights, an opposition war monitoring group, said IS was behind the attack.