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Acting Senior Sergeant Anthony Bond said a 59-year-old man refused to leave Henry's bottle store, in Hanover St, at 6.30pm.
He became verbally abusive and threatening towards staff.
The man eventually started to leave and then was restrained by a staff member, he said.
Staff were given educational advice about use of force and the man was issued a trespass notice.
Later in the evening, a 26-year-old man became aggressive towards other guests while drinking at UpTown Backpackers, in Moray Pl.
He was told to leave multiple times but refused, he said.
The man was trespassed from the address and taken home by police at about 10pm.