Incident happened on Central Promenade around 6.30pm yesterday
Police are appealing for witnesses and dashcam footage following an incident on Douglas promenade.
The incident happened on Central Promenade at around 6.30pm last night; no further details about the incident have been released.
The Isle of Man Constabulary says there is not believed to be any wider risk to the public.
Anyone who saw what happened, has footage or other information is asked to contact Police Headquarters on 631212.
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Steam Packet says the situation is hugely disappointing