Police are investigating two incidents of anti-social behaviour at Newmarket library in the last week.
The inquiries follow several reports of a group of young people verbally abusing staff, as well as riding their bikes inside the building and tipping over tables.
The first incident occurred on Saturday, July 15 between 10am and noon.
A group of young people rode their bikes around the Guineas shopping centre and into the library.
The following day a second incident occurred in which some youngsters verbally abused the staff in the library and refused to leave, between 12.45pm - 1pm.
Local PCOS Bill Butcher said: "This type of behaviour is unacceptable and unfair to both staff and other users of the service and the people doing this are certainly not representative of young people in the town.
"With the summer holidays almost here, we hope parents will work with officers to prevent this type of behaviour recurring."
Anyone who has any information that could assist the investigations is asked to contact Suffolk Police, quoting crime references 37/41118/23 or 37/41302/23.
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