Turkish forces pounded Syrian regime targets all night after a deadly attack on Turkish soldiers in Idlib, northwestern Syria, security sources said Friday morning.

Late Thursday, at least 33 Turkish soldiers were martyred and dozens of others injured in an airstrike by Assad regime forces in the Idlib de-escalation zone, just across Turkey’s southern border.

The soldiers in question are working to protect local civilians under a 2018 deal with Russia under which acts of aggression are prohibited in the region.

Aerial images taken by drones early Friday show the moment Turkish forces hit Assad regime targets from ground

Read more: Turkish forces pound regime targets in Idlib, Syria