The Syrian opposition's chief negotiator on Sunday called for renewed attacks on regime forces, despite the shaky truce deal between government troops and rebel fighters, AFP reports.

Mohammed Alloush, a leading political figure in the Jaish al-Islam (Army of Islam) rebel group, is in Geneva as the senior negotiator of the High Negotiations Committee.

A fellow opposition figure said Alloush's hawkish statement did not represent the HNC's position.

"Don't trust the regime and don't wait for their pity," Alloush wrote on Twitter.

"Strike them at their necks (kill them). Strike them everywhere," he said, reciting a passage from the Koran dealing with war.