The Syrian Observatory for Human Rights said the attacks followed a string of raids by regime war planes around the town, which the army is trying to recapture.
The raids came a day after loyalists backed by Hezbollah, the Lebanese Shiite movement, killed at least 17 Islamist fighters in the battle for Yabrud.
State news agency SANA said army forces carried out a string of operations in Yabrud and its environs today.
Hezbollah says car bombs used to attack it inside Lebanon originate in the Yabrud area and are driven to their targets via Arsal, a Sunni town where support for the Syrian uprising runs high.
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In Lebanon, the army said three rockets fired from Syria struck near the towns of Labweh and Nabi Othman, where Hezbollah wields influence, but caused no injuries.
The jihadist Islamic State of Iraq and the Levant (ISIL) claimed on Twitter responsibility for the rocket fire, which it said was in response to the operation against Yabrud.
The forces were killed in fighting for the town of Morek, which is on a key army supply route and was seized by rebels a month ago.
In the northeast, clashes erupted between government forces and ISIL after midnight around the regime's Base 17 camp near Raqa, the Observatory said.
More than 140,000 people have been killed in Syria since the start of a March 2011 uprising against the Assad family's 40-year rule.