The "Islamic State of Iraq and the Levant" (ISIL) is "completely besieged" in its last major stronghold in Syria's Aleppo province, AFP reported Monday (February 6th), as pro-regime forces piled pressure on the group on several fronts.

ISIL fighters were cut off in al-Bab after forces loyal to the Syrian government severed a road into the northern town, the Syrian Observatory for Human Rights said.

"Al-Bab is now completely besieged by the regime from the south, and the Turkish forces and rebels from the east, north and west," said the monitor.

It came after "the regime's forces and allied militia seized the only and last main road used by the jihadists between al-Bab and al-Raqa", Observatory chief Rami Abdel Rahman said.

Syrian forces were also locked in fighting with ISIL in the central province of Homs at the weekend, the Observatory said.

It reported that the troops had captured the Hayyan oilfield west of the desert city of Palmyra.

They also fought back against ISIL around al-Seen military airport north-east of Damascus, the monitoring group said.

On Saturday, Kurdish and Arab fighters announced a new phase in their campaign to capture al-Raqa, but said they needed more weapons to win.

The Syrian Democratic Forces launched their offensive for al-Raqa in November and have taken some ground further up the Euphrates Valley but are still some distance away.