Syria's army says it has begun implementing a US-Russian cease-fire, but the country's most powerful insurgent groups have not yet said whether they will abide by it.
The Syrian government and its main allies, Russia and Iran, say they will abide by the weeklong truce, which was set to begin at 7 p.m. (1600 GMT) on Monday.
Half an hour before the truce went into effect, violence was reported in several areas throughout Syria.
The deal, announced last week by Washington and Moscow, calls for a halt to fighting between the US-backed opposition and the Russian-allied Syrian government.
If the truce holds for a week, the US and Russia would begin intelligence sharing and target coordination against the Islamic State group and al-Qaida-linked militants.
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