A man threatened another man and a woman last night (Saturday) on Douglas promenade.
The incident happened at about 11.15pm near Central Apartments at the bottom of Broadway.
The man, who was wearing dark clothing, threatened one man and a woman and then chased the other man along the promenade in the direction of the Empress Hotel.
Police would like to speak with anyone in the area that can offer assistance with the investigation.
In particular, they would like to trace three men who were outside the Empress Hotel who told the victim to call the police.
Detective Sergeant Paul Holland said: ‘This incident occurred at a busy time and a number of people were in the area.
‘If you have any information regarding this, no matter how small please contact the police.’