Pubs and bars in the Norfolk seaside town of Cromer were on "lockdown" on Saturday night "following reports of low-level disorder".
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Norfolk Police said extra officers were on patrol and residents said a group had been fighting in the town, the BBC reports.
Locals took to Twitter to connect the disorder to the arrival of travellers in the area, but police have not confirmed this.
We have additional resources in #Cromer tonight following reports earlier today of low-level disorder - extra patrols to provide reassurance— Norfolk Police (@NorfolkPolice) August 19, 2017
Residents say the travellers have set up camp in the Runton Road car park.
According to ITV News, on Sunday morning most places, including the tourist information centre, were open as usual.
Morrisons closed it petrol station at 8pm on Saturday "to make sure our customers are safe."
Cromer Pier closed the Theatre Bar but the pier show continued as usual.