Syrian rebels seize UN peacekeepers

Syrian rebels have seized a convoy of UN peacekeepers near the Golan Heights and say they will hold them captive until President Bashar al-Assad's forces pull back from a rebel-held village which has seen heavy recent fighting.

The capture was announced in rebel videos posted on the Internet and confirmed on Wednesday by the United Nations, which said about 20 peacekeepers had been detained.

The seizure is the most direct threat to U.N. personnel in the nearly two-year-old uprising against Assad, and Human Rights Watch said it was investigating the same brigade for past executions.

It came on the day Britain said it would increase aid to the opposition forces and the Arab League gave a green light to member states to arm the rebels.

The Arab League also invited the opposition Syrian coalition to take Syria's seat at a meeting of the regional body in Doha later this month. Syria was suspended in November 2011 in response to its crackdown on protests which has since spiralled into civil war.

In the latest attack by the Syrian military, warplanes bombarded the north-eastern provincial capital of Raqqa for a second consecutive day on Wednesday, killing at least 39 people, opposition activists said. Video footage showed fighters putting dismembered bodies in an ambulance.

The peacekeepers of the UNDOF mission have been monitoring a ceasefire line between Syria and the Israeli-occupied Golan Heights, captured by the Jewish state in a 1967 war, for nearly four decades.

Israel has warned that it will not "stand idle" as Syria's civil war spills over into the Golan region.

The United Nations in New York said its peacekeepers had been detained by around 30 fighters in the Golan Heights. The Security Council and Secretary-General Ban Ki-moon condemned the seizure of U.N. observers and demanded their immediate release.

"The U.N. observers were on a regular supply mission and were stopped near Observation Post 58, which had sustained damage and was evacuated this past weekend following heavy combat in close proximity at Al Jamla," the United Nations said, referring to a village which saw fierce clashes on Sunday.

It did not mention the nationality of the observers, but the Syrian Observatory for Human Rights monitoring group, which is in contact with the rebel brigade, said they were Filipino.

In one rebel video, a young man saying he was from the "Martyrs of Yarmouk" brigade stood surrounded by several rebel fighters with assault rifles in front of two white armoured vehicles and a truck with "UN" markings.

"The command of the Martyrs of Yarmouk ... is holding forces of the United Nations Disengagement Observer Force until the withdrawal of forces of the regime of Bashar al-Assad from the outskirts of the village of Jamla," said the man, who was wearing civilian clothes.

At least five people could be seen sitting in the vehicles wearing light blue U.N. helmets and bulletproof vests.

"If no withdrawal is made within 24 hours we will treat them as prisoners," the man said, accusing them of collaborating with Assad's forces to push the rebels out of Jamla.

Nearly two years after the uprising started, rebels are distrustful of the United Nations, which they say has failed to support their cause.