Six people have been arrested on suspicion of murdering a 23-year-old woman in north London. 

Four women and two men were taken into custody after police and paramedics discovered the alleged victim unresponsive at a residential address on Bollinder Place in Islington on Thursday. 

She was pronounced dead after emergency services attended the scene following calls at 9.33am about concerns for her welfare. 

Police have now launched a murder investigation as they work to identify the 23-year-old and inform her next-of-kin. 

Four women – aged 20, 21, 23 and 26 – and two men – aged 21 and 24 – were arrested at the scene on suspicion of murder. They have all been released on bail. 

On Monday afternoon, there were two forensics vans on Bollinder Place, and a police officer was seen walking out of Valencia Tower. 

One resident said her housemate saw water on the floor of the building and a man in handcuffs coming out of the lifts.

Michelle You, 30, who has lived in the area for more than two years, said: 'My housemate said she saw a guy in handcuffs in the lift and she said there was loads of water on the ground. It was like they had caught him in the shower or something.'

Another resident said police had closed the spa in the basement of Valencia Tower while they conducted inquiries.

They added: 'The police checked the spa in the basement. I think yesterday it was closed, and everyone was like, "Oh, I want to go to use the swimming pool, but it's closed."'

One resident of a nearby block of flats, who wished to remain anonymous, said: 'You could hear the police on Thursday morning, it was frantic, I thought it was from the McDonald's.

'It all happened inside the building, it wasn't someone falling out.'

Chief Superintendent Jason Stewart said: 'This is a tragic incident and our thoughts remain with the family and friends of the young woman who has lost her life.

'We understand that news of an incident like this will cause concern within the local community. 

'Local officers will continue to be visible in the area and are available to speak with residents who have questions or concerns.

'While enquiries remain ongoing, information available to us at this stage indicates this was an isolated incident and there is no wider risk to the public.'

Detective Chief Inspector Paul Waller, who is leading the investigation, said: 'Our investigation is progressing at pace and detectives are working to establish exactly what happened in the time leading up to this woman's death.

'A number of people were arrested at the scene and have since been released on bail while enquiries continue. 

'Officers have been carrying out forensic examinations, reviewing available evidence and speaking to witnesses to build a full picture of the circumstances.

'We are keen to hear from anyone who may have information that could assist our investigation. 

'No matter how insignificant it may seem, I would urge anyone with information to come forward and speak with us.'

A Met Police spokesman said: 'A murder investigation has been launched and six people arrested following the death of a woman in Islington.

'Police were called at 09:33hrs on Thursday, 6 August following concerns for the welfare of a woman at a residential address on Bollinder Place, Islington.

'Police attended alongside the London Ambulance Service and found an unresponsive 23-year-old woman. 

'She was sadly pronounced dead at the scene despite the best efforts of medical professionals.

'Enquiries are ongoing to trace the woman's next-of-kin. Once identified, they will be supported by specially trained officers.

'At the scene, officers arrested four women, aged 20, 21, 23 and 26, and two men, aged 21 and 24, on suspicion of murder. 

'They have all since been released on bail while enquiries continue.'

Anyone with information has been urged to contact police on 101, quoting reference 3700/06AUG.

Information can also be provided anonymously to independent charity Crimestoppers on 0800 555 111.