Four people have been stabbed to death at a home in south-east London.
The victims, three women and a man, were all pronounced dead at the scene in Delaford Road, Bermondsey, in the early hours of Monday.
Officers attended and forced entry. Inside, they found four people suffering what are believed to be stab injuries.
Despite the efforts of emergency services, the victims were pronounced dead at the scene.
A man has been arrested on suspicion of murder and taken to a south London police station where he remains in custody.
Detectives from the Met’s Specialist Crime Command are investigating.
It is thought that all five people were known to each other.
Enquiries continue to establish the circumstances, a police spokesman said.