Updated

Syrian opposition activists and monitoring groups say the cease-fire in Syria appears to be holding since coming into effect the previous night, despite sporadic and minor violations.

Rami Abdurrahman from the Britain-based Syrian Observatory for Human Rights says "calm is prevailing" in most of the country on Tuesday, though there were minor violations in central Hama province.

Another activist group, the Local Coordination Committees reported some shelling in Aleppo and the southern region of Quneitra, while state media said there were "breaches" of the truce by rebels in the contested city of Aleppo.

Ahmad al-Masalmeh, an opposition activist in the southern province of Daraa — where Syria's crisis began in 2011 — says the region was also calm.

The week-long, U.S.- and Russia-brokered cease-fire started at sunset Monday.