The Russian airstrikes in Syria have destroyed the headquarters of dreaded terror group Islamic State (Isis), some reports claimed on Thursday.

According to some reports from Russia, the ministry of defence has said in a statement that the Isis headquarters in Syria were targeted in the massive raids on 30 September.

Russia had carried out its first airstrikes in Syria on Wednesday, within hours after getting the approval of the parliament.

"...headquarters of terrorist group and an arms depot were destroyed in the region of Ildib, as well as a militant three-level fortified command point in the region of Hama [in west-central Syria]," the MoD press statement says.

"Su-24M, Su-25 aircraft performed 8 sorties" to eliminate the Isis targets, it adds. Russia also claimed that to avoid civilian casualties the airstrikes are strictly restricted to the outskirts of Ildib region.

Since its first airstrike in Syria, there has been a growing allegation that the Russians are focused more on targeting groups opposed to Syrian President Bashar al-Assad than killing Isis terrorists.

A Sputnik report citing defence ministry spokesperson Igor Konashenkov said that Russia has carried out more than 20 raids at eight Islamic State terrorist positions.

The raids were carried out both day and night.