BEIRUT -- A Syrian rights group says the death toll from a military operation in a northern town has gone up to 25.

Rami Abdul-Rahman of the Syrian Observatory for Human Rights says the deaths occurred in the town of Jisr al-Shughour and included four policemen.

The operation is part of a crackdown that began Saturday and was continuing Sunday.

Details of the operations were sketchy and attempts to reach residents of the town were unsuccessful, possibly because communications have been cut.

State-run news agency SANA said Sunday four policemen were killed and more than 20 wounded in the area when "armed terrorist" groups attacked government buildings and police stations.