Police are questioning a man on suspicion of murder after the body of a Spanish student was discovered in a blood-spattered flat.
Officers refused to comment on reports that the victim was decapitated in the attack.
The 29-year-old suspect was arrested after a woman found the victim, named as Sergio Retamar Marquez, in a Bournemouth city centre flat on Tuesday.
It is believed the 23-year-old, from Coin near Malaga, southern Spain, moved to the UK to learn English.
Armed police were called to the incident in the Lansdowne Road area at 4.52pm.
Inquiries revealed a man left the scene along Holdenhurst Road in the direction of Bournemouth station.
The man, from Bournemouth, was arrested about 30 minutes later in the area of Beechey Road on suspicion of murder.
A spokeswoman for Dorset Police said officers are not looking for anyone else in relation to the incident.
Police said the incident happened at a busy time of day and are urging anyone who saw anything suspicious or has any information to call the police in confidence on 101, quoting incident number 17:354.
Commenting on claims Mr Marquez was decapitated, Detective Inspector Stewart Balmer, of the major crime unit, said: "There has been speculation in the press in relation to how the victim was discovered.
"It is never the case that the police discuss the findings at a crime scene, but the family are now being supported by Dorset Police and are fully aware of the circumstances."
Police said the man arrested in connection with Mr Marquez's death was known to him and has been transferred and bailed to a secure unit while inquiries continue.
A spokeswoman said: "Police are not looking for anyone else in relation to the man's death.
"Although the investigation into the circumstances is ongoing, Dorset Police can reassure members of the public that the incident was between two people who were known to each other.
"Several people have already supplied information regarding this incident. I would urge anyone with information to call 101."
Phil Quinlan, 58, was working at a funeral home across the street from where the attack took place yesterday afternoon when he heard screaming in broken English.
He said: "Two girls and a young fellow went into the building across the lane and came out screaming.
"Some builders rushed in to see what the problem was. They all came out asking for help and then the police arrived."