They say teams of specially trained officers will be out and about in the city centre at night keeping an eye out for anyone behaving strangely or suspiciously who they think may be trying to 'prey on vulnerable people'.
And they say that anyone who is up to no good will be dealt with 'robustly'.
Under 'Project Vigilant' - which is part of a national police operation - teams of officers in York and North Yorkshire have been specially trained to spot the 'tell-tale signs' that signal someone may have a sinister intent.
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A woman has denied causing the death of a man by dangerous driving at a country crossroads near York.
