Syria Files: special report

Security footage has emerged appearing to show three British schoolgirls, believed to be on their way to join Islamic State militants in Syria, waiting for hours at a bus station in Turkey.

One of the oldest and most beautiful cities in the world is now in ruins after four years at the centre of Syria’s bloody war. Drag the cursor across each image to see the destruction.

Exclusive: two British men who have returned from the Syria conflict say they went to the Middle East on a humanitarian mission “against a brutal regime” – and insist they are not terrorists.

The world is watching Islamic State group: but the war in Syria between rebels and President Assad is as being waged as fiercely as ever, as Lindsey Hilsum reports from the shattered city of Aleppo.

Turkish anarchists, who made headlines around the world during the battle for Taksim Square, have decamped to the besieged Kurdish town of Kobani to support the fight against the Islamic State.

More than 2,000 Syrian Kurds are evacuating the Kurdish town of Kobani, near the border between Syria and Turkey, as Islamic State militants advance towards the city centre.

Islamic State militants release a video apparently showing the beheading of US hostage Steven Sotloff – just days after the killing of American journalist James Foley.

Another young British Muslim has reportedly been killed fighting with the Islamic State in Syria, after an apparently normal life in the UK.

The head of the global chemical weapons watchdog tells Channel 4 News it is an “open question” if hidden chemical weapons remain in Syria, two days after the last shipment was supposed to have left.

President Bashar al-Assad is widely expected to win a third seven-year term in office, as Syrians head to the polls in the middle of a civil war that has killed more than 160,000 people.

Until recently, Nawal Msaad was an outgoing University student – but she has now come to be known as the first British Muslim woman accused of Syria-related terror offences.

Hundreds of foreigners could unknowingly be fighting for President Assad following reports of a deal struck between the regime and extremist group Isis.

A teacher from Bolton, whose younger brother is missing in Syria, is remanded in custody after being charged with helping others to prepare acts of terrorism.

New pictures and a “martyrdom” video are released of a British Muslim man suspected of being Britain’s first suicide bomber in Syria. Home Affairs Correspondent Darshna Soni reports.

Aid workers resume humanitarian operations in Homs – a day after they came under fire in the besieged rebel heart of the Syrian city.