Fierce fighting between Kurdish militia and Free Syrian Army provided opportunity for Isis.
Kerry said that a deal must 'work for the people of Syria' and 'make the region more stable'.
UN confirms that Assad and Isis have used chemical weapons on civilians in the Syrian Civil War.
America has chosen to placate Turkey rather than back Kurdish anti-Isis forces.
Jarablus was 'taken back' just hours after Syrian rebels and Turkish tanks entered the city.
Arrest of 32-year-old comes days after a man and 16-year-old girl were detained over plans to join Isis.
Advance preceded by air strikes and artillery bombardment in Turkey's largest intervention in Syrian civil war.
We must Daesh with ideas as well as bombs.
Townsend makes comments after Syrian warplanes attack area where US forces were operating.
Girls, some 13, have arrived in Germany married to men more than twice their age.
Images of Omran Daqneesh, 5, after he was pulled from rubble stunned the world.
More than 100 jihadists escaped the city in a convoy of cars and trucks carrying civilian hostages.
Scenes like the air strike that wounded Omran Daqneesh are all too common in Syria.
Over my long life I have seen this look of shock before - you never forget a face that has seen the horrors of war.
Social media is a powerful weapon, but hashtags can create a false sense of doing something meaningful.
It is Syrian people - not their tormentors - which are lacking in negotiations to end Syria's war.
Amnesty International estimates 17,723 people have been killed in detention since March 2011
Pro-government forces have encircled the militants in a shrinking section of the centre of Daesh's former North African stronghold.
A leaked response shows German officials acknowledge Raccip Tayyip Erdogan's support for militants.
Children have been traumatised and the scale of the suffering is immense says the Red Cross.
Russia's defence minister Sergei Shoigu complains US not sharing information about extremists.
A Washington think-tank has said amid growing security instability in Turkey that US nukes may be at risk.