Melksham Neighbourhood Policing Team is increasing patrols after teenagers were seen throwing eggs and dog mess at cars.
Police were called on Sunday to reports of a group throwing the objects at passing vehicles on the A3102 near the junction with Hawthorn Road.
The group fled when police arrived.
A black and white BMX bicycle was found there and has been taken to Melksham police station for the owner to collect.
Anyone with further information about who was involved, or has had eggs thrown at their property, should call police on 101.
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