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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The study, conducted by the European Banking Authority, looked at how much capital would be used up in adverse economic conditions.
The victims were playing the popular game in Whittington Park in Holloway on Tuesday night, when three males suspects approached them.
A former Royal Marine who was recently engaged has been killed in a climbing accident in the French Alps.