A string of arson attacks on the canopies in Northampton market square has led to a police appeal for witnesses.
On January 6, between 10pm and 10.30pm, the canopy of a market stall was deliberately set alight.
There have been recent reports of similar incidents and officers are appealing for information.
Four teenage boys were arrested in connection with the incident and have been released under investigation while inquiries are ongoing.
Witnesses, or anyone with information, are asked to contact Northamptonshire Police on 101. Alternatively, they can call Crimestoppers anonymously on 0800 555111.