A man held a knife to his own throat and also waved it at police during a disturbance at Great Sankey, Warrington, during the night.
The man was arrested for allegations of criminal damage and affray in the Sankey area.
During another incident a man was arrested in the Poplars & Hulme area for an allegation of causing Actual Bodily Harm.
It is alleged that the man held a sharp implement against the throat of a female victim.