(Image: Archant)
Police were called after a group of teenagers let off a fire extinguisher.
The group, all white and aged between 17 and 19, discharged the extinguisher on the station forecourt at the Shell Garage in Brentvvood Road, Romford.
The incident took place at 4am on Saturday, February 2.
Anyone with information should call Romford CID on 101 or contact Crimestoppers on 0800 555 111.
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