Sadiq Khan has said he is "heartbroken" after three women and a man were killed in south London last night.

The Mayor of London added that his thoughts are with the family and friends of those who lost loved ones in this "awful crime".

The four were pronounced dead at the scene after officers forced entry into a home in Delaford Road in Southwark at around 1.40am this morning following disturbance reports.

They were found with what is believed to be stab injuries.

Sadiq Khan assured followers on Twitter that an investigation is underway and a man has been arrested.

Khan's full statement said: "Heartbroken to hear 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 & friends of those who have lost loved ones in this awful crime.

"An investigation is underway and a man has been arrested."

Local MP Harriet Harman described the fatal stabbing of four people in Bermondsey as a “terrible tragedy”.

The MP for Camberwell and Peckham told reporters at the scene: “Tragically four people have been killed and that is shocking to happen anywhere but especially in this very peaceful, quiet, very settled community here.

“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”.

Asked about the victims, Ms Harman said: “I don’t really want to say anything more than the police are actually saying.

“The police will be giving information and are obviously conducting the investigation with all the forensics here as we speak.

“But it’s a terrible tragedy and our thoughts are with the family and friends of those who’ve tragically had their lives cut short”.

A Met Police spokesperson said: "Detectives are investigating the deaths of four people in Southwark.

"A man has been arrested.

"Police were called at about 01:40hrs on Monday, 25 April to reports of a disturbance at a residential address on Delaford Road, SE16.

"Officers attended and forced entry.

"Inside, they found four people suffering what are believed to be stab injuries.

"Despite the efforts of emergency services, all four people – three women and a man - were pronounced dead at the scene.

"Officers are in the process of contacting next of kin. Post-mortem examinations will be arranged in due course.

"A man has been arrested on suspicion of murder and taken to a south London police station where he remains in custody.

"Detectives from Specialist Crime are investigating.

"It is thought that all five people were known to each other.

"Enquiries continue to establish the circumstances."

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