At least 32 civilians were killed on Tuesday when Syrian regime forces attacked opposition-held towns and villages across the war-torn country, the Syrian Network for Human Rights has reported.

According to the U.K.-based NGO, the attacks – carried out using warplanes, helicopters, tanks and artillery – killed 17 in Idlib, eight in the countryside surrounding Damascus, two each in Aleppo and Hama and one each in Kenitra, Deraa and Deir ez-Zour.

According to UN figures, more than 220,000 people have been killed in Syria since the conflict began in 2011 between pro-regime forces and armed opposition groups.