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The Syrian Observatory for Human Rights said a group of army deserters had carried out the attack in Maaret al-Numan, located in Syria's Idlib province. The army has since March 9 carried out an offensive in the mountainous region near the Turkish border, in a bid to seize control of the city of Idlib and other towns of the province where rebels are based. Dozens of people have been killed since last week in on-off army shelling of the city, which is now partly controlled by the regime, and in violence across the province.