An electrical fault caused a series of loud blasts early on Sunday near a military airbase outside the Syrian capital Damascus, a Syrian military source cited by state media and an Iranian official said.

Iranian Defence Minister Amir Hatami travelled to Damascus on Sunday for a two-day visit.

Their belongings piled nearby, elderly displaced Syrians struggled against the wind as they fastened a white tarpaulin on the metal frame of their makeshift new home in the country's south.

The death toll is expected to increase as some of the 60 injured in the strikes were in a critical condition, he said.

The government on Monday seized the Yarmuk Palestinian camp and adjacent neighbourhoods of Tadamun and Hajar al-Aswad, putting Damascus fully under its control for the first time since 2012.

A second batch of fighters from the Islamic State militant group left their final Damascus stronghold overnight, a monitor said Monday, bringing the Syrian regime closer to a major milestone.

The recovery of the enclave south of Damascus would mark another milestone in President Bashar al-Assad's war effort, crushing the last besieged rebel enclave in western Syria.

A first batch of Islamic State group fighters left their final stronghold in Syria's capital early Sunday under a deal struck after weeks of fierce combat, a monitor said.

A car bomb and shellfire in Syria's capital Damascus killed two people and wounded several others on Wednesday, state television said.

The death toll of a suspected Israeli strike on the outskirts of Damascus has risen to 15 non-Syrian pro-regime fighters including eight Iranians, a Britain-based war monitor said Wednesday.

More than 30 Syrian government troops have been killed in a southern district of the capital in a fierce counter-offensive by Islamic State group fighters, a monitor said Monday.

The Syrian government and rebels have reached a deal to evacuate opposition fighters from an area of southern Damascus near the site of a regime offensive against jihadists, state media said Sunday.