Twelve tanks and armoured vehicles, along with 10 large buses full of troops stormed the towns of Taftanaz and Sermin as part of a military offensive to crush reform protests.
The incident sends the death toll close to 400 in the ten days since the army killed 145 people on the eve of Ramadan, the Muslim month of fasting and prayer.
It was one of the deadliest bouts of violence since the uprising against President Bashar al-Assad began five months ago.
Human rights groups claim the death toll since March is somewhere between 1,700 - 2,000, although this is an estimate as the country has banned foreign media and restricted any local coverage that strays from the party line.
Amnesty International predict a 'conservative' estimate would be more than 1,600.
Spokesman Neil Durkin said: 'We're trying to piece together numbers as some information is getting out through telephone calls and the internet, no matter how much the country is trying to stop it getting out. Read More