At least a dozen people died in today's air strikes by Syrian warplanes along the Turkish frontier, according to opposition activists.
The pro-opposition Syrian Observatory for Human Rights put the death toll from the bombing of the rebel-held town of Ras al-Ain at 12, including seven Islamist militant fighters.
Syrian grassroots opposition group, the Local Coordination Committees, said 16 people had died.
Thousands more refugees pour across the border to escape the war in Syria, whilst Turkey says the conflict is threatening their security.
A suggestion that David Cameron has gone "out on a limb" over Syria has been rejected by his official spokesman.