It was unclear why Syrian forces targeted the town.
Activists and rights groups accuse the Syrian government of President Bashar Assad of taking revenge for victories by rebel forces on civilian populations who support them.
Rebels have been clashing with government forces in recent days in the region around Halfaya, some 25 kilometres northwest of Hama, most notably in the village of Morek. Activists say rebels have taken over a number of regime checkpoints there as part of an effort to control the country's main north-south highway.
Syria's crisis began in March 2011 with political protests and has since evolved into a civil war, with scores of rebel groups across the country battling Assad's forces.
Activist say more than 40,000 people have been killed.
International diplomacy has failed to slow the crisis.
International envoy Lakhdar Brahimi was in Damascus Sunday to push for a negotiated solution to the conflict. Previous efforts have proved fruitless.
- AP