Two men are being treated in hospital after being found with stab wounds outside a McDonalds restaurant in Regent Street. It happened just before 3:30 Saturday morning.
The men's injuries are not thought to be life threatening and no arrests have been made.
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To count as a 'White Christmas' just one flake of snow has to fall on Buckingham Palace roof on Christmas day.
The row over parking allegedly started after the local council re-paved a road in Harrow.
The officer, known only as NC32, ducked for cover behind a car as eight rounds were fired directly at him.