BEIRUT (AP) — A Syrian war monitoring group says pro-government forces have captured the last Islamic State group stronghold in the energy-rich Homs province in central Syria.

The Britain-based Syrian Observatory for Human Rights monitoring group says 30 IS militants were killed in the last 24 hours of battle for the town of al-Sukhna. It says the Russian air force provided air support and bombed the town.

The Observatory said al-Sukhna fell to pro-government forces on Saturday.

Syrian military media reported capturing the town on Sunday. The advance puts pro-government forces 68 miles (110 kilometers) from reaching companion forces trapped in the eastern city of Deir el-Zour. IS militants have held the city under siege since 2015. It has depended on risky supply flights and air drops for relief and weapons.