A UN official expressed the “gravest” alarm Thursday that a military offensive in northwest Syria is having catastrophic humanitarian consequences due to the “unprecedented number of persons displaced.” 

“Airstrikes and shelling continue affecting dozens of communities and villages in Idlib and Hama. Civilians, including children, continue to be killed,” Najat Rochdi, Senior Humanitarian Adviser to the Special Envoy for Syria, said in a statement after a task force meeting of diplomats from concerned missions in Geneva.

Rochdi said at least 11 civilians were killed, seven children, and more than 40 people were injured when strikes hit a school Feb.

Read more: UN aide gravely alarmed at Idlib military escalation