A man has been arrested on suspicion of murder after four people were stabbed to death at a house in south London, the Metropolitan Police said.
Police were called at around 1.40am on Monday following reports of a disturbance at a property in Southwark.
After forcing entry to the home, they discovered four people suffering from what are believed to be stab wounds. All four - three women and a man - were pronounced dead at the scene.
A man arrested on suspicion on murder is in custody at a south London police station.
It is thought all five people were known to each other.
Next of kin are being contacted.
This is a breaking news story. More to follow.