Four teenagers were arrested after a series of assaults in Dereham.
Police were called to the Market Place, Sandy Lane and Harold Whitby Close areas between 5.25pm and 7.10pm after receiving five reports of assaults and public order offences.
An anonymous Facebook post said at least two of these were unprovoked attacks on passers-by.
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Nobody required hospital treatment.
The teenagers were taken to Wymondham Police Investigation Centre for questioning and were subsequently released on bail.
Anyone with information should contact PC Hannah Clark on 101 or hannah.clark2@norfolk.police.uk quoting reference 36/76214/23.
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