Refugees are fleeing Syria in ever greater numbers, UN agencies said yesterday, as the conflict between President Bashar al-Assad’s forces and rebels intensifies.

Syria said it shot down a Turkish military plane that entered Syrian air space, while Turkey vowed to “determinedly take necessary steps” in response.

Syrian forces fired across the border yesterday into a refugee camp in Turkey, wounding at least five people as a UN-brokered plan to end more than a year of violence this week all but collapsed, authorities said.

The bloody conflict in Syria spilled across two borders today, killing a cameraman in Lebanon and wounding at least five people in a refugee camp in Turkey as gunfire flew across the tense frontiers, authorities said.

A UN-brokered plan to stop the bloodshed in Syria has effectively collapsed after President Bashar Assad's government raised new, last-minute demands that the country's largest rebel group swiftly rejected.