The man in the Guildford explosion story has been named locally as Mark Essex. He is a cleaner at Guildford College. His girlfriend was killed in the blast. A post mortem examination on her body is due to be carried out later today.
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Police say he may have attacked more children and urged them to come forward.
The suspect walked up to a Tesco employee and shoulder barged him to the ground before punching him repeatedly in the face.
Up to 200 noisy motorists regularly meet in Imperial Way, Croydon attracting crowds of up to 400 people.