Tens of thousands of Syrian refugees have gathered near a border crossing with Turkey after fleeing a major government offensive on rebel-held areas in the Syrian city of Aleppo.

At least two Pakistan airline employees have been killed and several others injured after clashes broke out between police and workers protesting against the privatisation of the national carrier, hospital officials said.

Yemeni President Abdrabu Mansur Hadi said Tuesday that military operations against Houthi militias would not stop until the Yemeni capital was liberated.

Israeli forces demolished 24 Palestinian buildings in a disputed military zone in the West Bank Tuesday, including 10 funded by the European Union, leaving families homeless, authorities and residents said.

A suicide car bomb rocked a police base in central Kabul on Monday, leaving several bodies strewn around the area, officials reported.

Israel on Monday blocked entry for non-residents to the West Bank city of Ramallah, where the Palestinian Authority is based, after a shooting attack the previous day that wounded three soldiers, the army said.

The Islamic State of Iraq and Syria (ISIS) group on Sunday claimed responsibility for bombings near a revered Shiite shrine outside the Syrian capital Damascus that killed at least 60 people, including 25 Shiite fighters.

More than 10,000 unaccompanied refugee and migrant children have disappeared in Europe, the EU police agency Europol said on Sunday, fearing many have been whisked into sex trafficking rings or the slave trade.

Residents of the besieged Syrian town of Madaya continue to die of starvation and a lack of medical supplies, despite the delivery of aid earlier this month, according to a leading humanitarian agency.

At least 39 migrants, including several children, have drowned trying to cross the Aegean Sea from Turkey to Greece, coastguards say.