Youths are believed to be arranging a Saturday afternoon fight for Lisburn city centre , according to police.
The details have been shared on social media and intercepted by the PSNI .
Now officers are warning that anyone found to be involved in the potentially violent situation will be "swiftly dealt with".
A spokesperson for the PSNI said: " Police in Lisburn are aware of a possible arranged fight that is due to take place in the city centre this afternoon between groups of youths.
"Anyone who is thinking of participating in such behaviour we would strongly advise you think twice about it. Anyone found to be involved will be swiftly dealt with.
" Lisburn City NPT along with our partners at Citywatch will be heavily monitoring the situation throughout the area. If anyone is aware of this occurrence and has information that could be of use to us please contact through 101 or through these means."
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