Chief Inspector Chris Veale said officers were dispatched to intercept the group but searched and could not find them.
He said a possible link between the report and the window being smashed was being explored although there was no current evidence to connect the two.
He added: “We do not currently have evidence of a general problem of antisocial behaviour in this area of Kemp town. However, we are always keen to hear from residents and would encourage anyone experiencing anti-social behaviour to report it.”
There really are no words, are there?