ISIS advances in Syria against regime and rival rebels

The Islamic State group seized territory from both Syrian government forces and rival rebels over the weekend further expanding the caliphate it has proclaimed straddling Iraq and Syria.

The Syrian Observatory for Human Rights said that following gains in both Homs province in the centre and Aleppo province in the north, ISIS now controlled half of the country's land area.

Geographer and analyst Fabrice Balanche said that across Iraq and Syria, the jihadist group now controlled nearly 300,000 square kilometres, an area the size of Italy.

Meanwhile, Iraqi authorities say multiple Islamic State suicide attacks targeting a police base have killed at least 30 troops in western Anbar province.

Police officials said three suicide bombers yesterday simultaneously drove their Humvees, seized from the Iraq army, into a police base in the Tharthar area. The attacks caused a large explosion in an ammunition depot inside the base.

In Aleppo province -- on Syria's border with Turkey -- ISIS has expanded its control at the expense of rival rebel groups.

ISIS captured the village of Suran on Sunday taking them to within 10 kilometres of the border, the Observatory said.

Three days of heavy fighting left 30 IS fighters and 45 rival rebels dead, the Britain-based watchdog said.

Yesterday, the group advanced towards the town of Marea, which lies on a key supply route from Turkey for its rebel opponents.

ISIS previously targeted Marea in April, detonating two car bombs and killing 15 rebel fighters, but it was unable to take the town.

In central Syria, ISIS ousted government forces on Saturday from a strategic crossroads south of the ancient oasis city of Palmyra.

The checkpoint and nearby village of Basireh lead south to Damascus and west to Homs, as well as east to ISIS-controlled areas of Iraq.

"The road is now open (for ISIS) from Palmyra to Anbar province in Iraq, without any obstacles," said local activist Mohammed Hassan al-Homsi.

ISIS overran Palmyra on May 21 after a bloody advance across the desert from their stronghold in the Euphrates valley to the east.

The city's fall came hot on the heels of the jihadists' capture of Anbar provincial capital Ramadi from Iraqi government forces.

That defeat forced Baghdad to call in Iran-backed Shiite militia forces to the predominantly Sunni province in a move that risks complicating its efforts to win the population back from the Sunni extremists of ISIS.

An Iranian officer was killed last week while advising Iraqi forces on their campaign to recapture Ramadi, Iranian state media reported yesterday.

In northeastern Syria, ISIS has advanced to within two kilometres (little more than a mile) of the provincial capital of Hasakeh, the Observatory said.