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The incident unfolded at about 14:00 local time (04:00 GMT) on Tuesday near Clarence St and King St, a busy area in the city centre.

Police said the suspect had stabbed a 41-year-old woman in the back before being restrained by three members of the public.

They "placed him essentially under arrest, even though he was branching a large butchers knife and was clearly dangerous".

Emergency services arrived shortly after and following a wider investigation, the body of a 21-year-old woman was found nearby.

The injured woman was taken to hospital in a stable condition. Police said there was no ongoing threat.