A man is being questioned on suspicion of murder following a medical emergency in Holyhead.
Police and Welsh Ambulance Service paramedics were called to an address on Morawelon Road shortly before 3.50am on Sunday morning.
A 61 year-old man was arrested and remains in custody.
Detectives say it was an isolated incident and there is no ongoing threat to the wider community.
No further details have been released but police are maintaining an increased presence in the area over the next 24 hours as part of their investigation.
Detective Inspector Rob Mahoney of North Wales Police said: “I would like to reassure the public that we are treating this as an isolated incident, and there is no ongoing threat to the wider community.”
“You will see an increased police presence in the locality over the next 24 hours as detectives continue to investigate the circumstances of this incident, and I would ask that anyone with information that could assist us makes contact via our live webchat or on 101 quoting reference O178536.”
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