A man arrested on suspicion of manslaughter has been released as police continue to investigate the sudden death of a man in a flat - as it emerged a post mortem had failed to establish how he died.

Ambulance crews attended an address in Portmore Gardens, based off Wyke Road in Weymouth, in response to a 999 call at 10.55am on Monday (October 11).

Paramedics were unable to revive a man in his 50s within the flats and he was pronounced dead. His family has been informed and the coroner has been notified.

Police officers were later called to Portmore Gardens at around 12.20pm and a man aged in his 20s from Weymouth was arrested on suspicion of manslaughter.

Enquiries into the circumstances surrounding the death are being carried out by detectives from the Major Crime Investigation Team (MCIT).

Dorset Echo: A forensic investigation van was parked near the address at Portmore Gardens, Weymouth as investigations continue. Picture: Dorset EchoA forensic investigation van was parked near the address at Portmore Gardens, Weymouth as investigations continue. Picture: Dorset Echo

In an update given by Dorset Police, a post-mortem examination took place on this morning (Tuesday, October 12) found the initial cause of death is undetermined and further toxicology tests have been requested.

The man arrested on suspicion of manslaughter, who was known to the victim, has been released under investigation while enquiries continue.

Detective Inspector Wayne Seymour, of MCIT, said: “A detailed investigation has been launched and I would appeal to anyone with information that may assist our enquiries to contact us.

“At this time the cause of death is not clear, but we are following all lines of enquiry to establish the full circumstances.

“Officers are keeping the victim’s family updated with any developments and they continue to be supported by specially trained officers.

Dorset Echo: Police at Portmore Gardens, WeymouthPolice at Portmore Gardens, Weymouth

“There has been an increased police presence at the scene while we continue to investigate the incident and local officers can be approached by members of the community with any information or concerns.”

Anyone with information is asked to contact Dorset Police at www.dorset.police.uk, via email 101@dorset.pnn.police.uk or by calling 101, quoting occurrence number 55210163696.

Alternatively, to stay 100 per cent anonymous, contact the independent charity Crimestoppers online at Crimestoppers-uk.org or call Freephone 0800 555 111.