At least 23 soldiers have died in clashes in the central Syrian city of Rastan, according to activists.
The UK-based Syrian Observatory for Human Rights said dozens were wounded in the attack in the city, in the restive province of Homs.
Three troop carriers were destroyed in fighting, the group said.
If confirmed, the attack would be one of the deadliest suffered by security forces in the 14-month-long uprising against President Bashar al-Assad, according to BBC.