A knife was reportedly pulled when a dispute broke out in a park.
Police say they are aware of an incident which happened in Oxhey Park on Sunday.
A police spokeswoman said: "Police were called shortly after 7pm on Sunday October 19 following an incident in Oxhey Park, Watford.
"It was reported that an altercation had occurred between a group of males near the skate park, around half an hour before hand.
"One of the males is reported to have produced a knife before the group dispersed.
"Officers attended but there was no sign of anyone still in the area. No further reports have been received at this time."
Police added those involved are believed to be aged around 15 and 16, and they were wearing tracksuits with the hoods up and face coverings.
Anyone with information is asked to contact police on 101.
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