Six Tupolev Tu-22M3 strategic bombers have delivered massive airstrikes against a major Islamic State camp and ammunition depots in Syria, Russia’s Defense Ministry says. The aircraft flew from Russia and returned home after the operation.

The bombers, based at one of Russian’s southern air bases, took off on Tuesday morning, passed through Iranian and Iraqi airspace and delivered concentrated high-explosive ammunition airstrikes on terrorist targets east of the towns of Palmyra and As Sukhnah, and the village of Arak.

All aircraft have successfully returned to home base, the ministry said in a statement.