Temporary Detective Chief Superintendent Gordon Lang has urged the public to check on family and friends to make sure "everyone is safe" after the arrest of double murder suspect James Allen.
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Merve Buyuksarac, who was crowned Miss Turkey in 2006, was handed a 14-month suspended sentence for sharing a satirical poem on Instagram.
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.