(CNN) – At least 90 people were killed in airstrikes that rained down on northwestern Syria on Saturday and Sunday, a rights group said. The surge in violence came just hours after the US and Russia announced a new ceasefire plan. The airstrikes landed in the rebel-held areas of Idlib in the northwest and Aleppo in the north of the country, according to the monitoring group Syrian Observatory for Human Rights. The worst strikes were in Idlib, where at least 61 people were killed and more than 100 wounded in an attack that targeted a crowded market, an activist who witnessed the bombing and its aftermath told CNN.
