Mr Turner has now reported the incident to the police but they refused to comment when contacted by The Herald.
"You have to report it," he said "But I don't think there is much they will do. I just want to warn other people.
"It really was quite frightening. Someone could get hurt."Yes, the police, if they turn up. That's probably why they don't!
Ward councillor Vivien Pengelly said she "couldn't understand" why the police were not using what she believes to be new powers to move the group on.
She said: "I really do think that the police are not quite clear about these new powers but I know other authorities who have used them.
"Why aren't local police using them?
"I really feel for the residents in that area. Some of them are quite terrified."Ah, if only we had a ... force, I guess, of people prepared to ensure the laws were obeyed and the peace was kept. Wouldn't that be nice?