Rebel forces close in on Raqqa

The Syrian war has taken a dramatic new turn, and it could signal the end of the Islamic State’s grip on much of the country. Their capital of Raqqa has been under attack from both pro-democracy rebels, backed by America, and the Syrian Government, backed mainly by Russia and Iran. But if there was a race to Raqqa, it is the US-backed rebels who have got there first. Channel 4 News’ Krishnan Guru-Murthy, Thom walker and Soren Munk are in Damascus.