Footage released by Russia’s Defence Ministry shows smoke rising after airstrikes carried out by Russian air force on what Russia says was a bomb factory in Maarat al-Numan, south of the town of Idlib.

Russian planes have flown 20 sorties in Syria and struck 10 Islamic State of Iraq and Syria (ISIS) targets in the past 24 hours, the country’s defense ministry said in a statement on Sunday.

Russia has said it would step up its air strikes in Syria, escalating a military intervention which Moscow launched on Wednesday to weaken ISIS militants, but which Western powers say aims to support President Bashar al-Assad.

“As a result of our air strikes on Islamic State [ISIS] targets, we have managed to disrupt their control system, the terrorist organization’s supply lines, and also caused significant damage to the infrastructure used to prepare acts of terror,” the ministry said.

It said the strikes, conducted by SU-34, SU-24M and SU-25 planes, had hit targets in the Idlib and Raqqa provinces, including a terrorist training camp and a suicide belt factory.

The strikes, which it called pinpoint, had also destroyed three ammunition stores and four ISIS command centers, the ministry said.