Police have told of the "dreadful discovery" after four people were found stabbed to death in a house in southeast London.
A man in his late 20s has been arrested on suspicion of murder following the "deeply shocking incident" in Bermondsey, the Metropolitan Police said.
Three women – aged in their 60s, 40s and 30s – and a man in his 60s were found dead after a reports of a disturbance at the house in the early hours of this morning.
All four people, who were found inside the property, were pronounced dead at the scene.
The man arrested on suspicion of murder was taken to a south London police station where he remains in custody.
It is thought that all five people were known to each other.
Speaking near the scene, the niece of one of the victims paid tribute to her aunt and said she "didn’t deserve this".
Venecia Reid, who was visibly upset, said: "She was very loving, very kind, very generous.
"She worked very hard in this country to support her two girls and her two grandkids.
"She does not deserve this."
Met Police Chief Superintendent Colin Wingrove said neighbours had contacted police and officers forced entry into the house in Delaford Road.
He said: "Inside the house they made a dreadful discovery of four people who had been stabbed.
"This is a deeply shocking incident and we will do everything we can to provide support to everyone affected at this difficult time.
"Such terrible events are rare but this will not diminish the shock that will be felt across London and beyond."
Part of the residential street was closed off with metal hoarding and a number of forensic tents had been put up as police carried out their investigations on Monday.
Anne Birkett, whose back bedroom looks on to the property where the victims were found, said she was woken by police sirens and a circling helicopter.
The 60-year-old said: "It’s devastating – you hear all of this but you never assume it’s going to be right on your own doorstep.
"I’m a foster carer and I’ve got children in my care, and now I’ve got to protect them now because of what’s happened."
The scene is close to Millwall FC’s stadium The Den and South Bermondsey train station.
Local MP Harriet Harman described the killings as a "terrible tragedy", telling reporters at the scene that the community was "very peaceful" and "quiet".
She said: "The police have arrested someone but it’s really important still that people give information – any information they’ve got – to the police so that whoever committed this horrific crime can be brought to justice.
"It’s a terrible tragedy and our thoughts are with the family and friends of those who’ve tragically had their lives cut short."
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The Met Police said officers, who were called to the property at 1.40am, are not looking for anyone else in connection with the incident.
"Despite the efforts of emergency services, all four people – three women and a man – were pronounced dead at the scene," a force spokesperson said.
Detectives from the Met’s specialist crime unit are investigating and officers are contacting next of kin, with post-mortems due to take place.
London Mayor Sadiq Khan said: "I am heartbroken that three women and a man were killed last night in a devastating incident at an address in Southwark.
"My thoughts are with the family and friends of those who have lost loved ones in this awful crime."
Mr Khan said he was in contact with Met Police chiefs and urged anyone with information about the incident to contact officers immediately.
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