Secretary of State John Kerry said the US would provide the Syrian opposition with $60 million (about £39 million) in new aid and added that they would work with the rebel fighters.
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Muhiddin Mire cut the throat of a stranger at an east London tube station "in revenge for the fight against IS", a court heard.
The significant development came after a forensic re-examination of a palm print left on a getaway vehicle.
Carla Lane was once one of the UK's highest paid screenwriters.