An investigation is under way into the death of a man in his 50s who was sleeping rough in Dublin city centre.

The man, who gardaí say appears to have been homeless, was found unconscious at 4am this morning on a footpath on Suffolk Street, close to Grafton Street.

He was treated at the scene and taken to St James's Hospital where he was pronounced dead.

Foul play is not suspected at this time.

The coroner has been notified and a post-mortem examination is due to be carried out.

Charities working with homeless people have expressed sadness at the man's death.

Pat Doyle from the Peter McVerry Trust said he believed the man was homeless since 2015 and had sporadic engagements with outreach services.

He also said the death once again underlines the vulnerability of people sleeping rough and said it demonstrates the need to do more to provide safe and secure homes so people can leave the streets behind.

The Chief Executive of the Inner City Helping Homeless group described the death as "a tragic but preventable accident."

Anthony Flynn said Dublin's rough crisis is out of control, with the ICHH's teams reporting the highest ever number of rough sleepers on one night.

He said "immediate emergency measures are required to tackle the rough sleeper crisis.

"I'm calling on the Minister to immediately open empty beds - this is not the first and will not be the last death on our streets. Somebody must be held accountable," he said.

The Dublin Region Homeless Executive have also expressed their condolences to the family and friends of the man.

They said statutory and state-funded voluntary homeless services had made a number of interventions with him since October 2015.