JONATHAN RUGMAN, ITN:

It was just after this Syrian child had been carried in an ambulance in Aleppo yesterday that another bomb fell.

The bombs don't discriminate, and the fighting for Aleppo is now so intense that the Turks say up to 30,000 Syrian refugees are now camped out along their border. From the Turkish side, we can't see any of them. What we can see are tents and aid going across and ambulances coming out.

Turkish hospitality appears to have reached its limit, though the cross-border trade in coffins could become even busier. Well, the Turks are certainly letting these aid trucks into Syria. They're just not letting the Syrian refugees come out.

The Turks say they are full to capacity, that they're trying to prevent an even bigger refugee exodus. But there may be another motive at work here, because, by keeping Syrian civilians inside the Syrian border, the Turks are effectively creating a buffer zone between the Turks and Syrian government forces and Kurdish forces and so-called Islamic State.

Of course, millions of Syrians were given sanctuary here before the border shut. They had assumed their relatives could join them, and now they can't. Syrian rebels are sending reinforcement also, but they now claim that government forces are just 16 miles from the Turkish border.

And though the rebels are themselves using heavy weapons, Turkey and its Western allies are laying blame for the latest exodus firmly at the door of Russian airstrikes.