DHAKA: US Secretary of State John Kerry says all alleged violations of the partial truce in Syria will be investigated.

He said the US and Russia were working on a mechanism to ensure any strikes targeted so-called Islamic State (IS) or al-Qaeda-linked Nusra Front.

Kerry said they had agreed not to debate alleged violations in public, reports the BBC.

Aid convoys have begun reaching besieged areas of Syria as the cessation of violence, that began on Saturday, appeared to be holding.

But France expressed concern about reports of strikes by Syrian government and Russian aircraft on areas controlled by mainstream rebels.

Russia says it is only targeting UN-designated jihadist terrorist organisations - including IS and the Nusra Front, which is part of a major rebel alliance - in line with the terms of the cessation of hostilities.

Kerry, speaking in Washington alongside German Foreign Minister Frank-Walter Steinmeier, said teams in Geneva and the Jordanian capital Amman would look into all reports of violations.

"We are going to track down each alleged violation and work even more now to put in place a construct which will help us to guarantee that [military] missions are indeed missions against Nusra or missions against Daesh (IS)," he said.

BDST:  0850 HRS, MAR 01, 2016
RS