Post-mortem examinations will take place today for the three children who were found dead at a property in New Malden.
The bodies of the children - twin boys aged three and a four-year-old girl - were discovered by officers at around 9.30pm on Tuesday night in Thetford Road, New Malden.
The examinations will take place at Great Ormond Street hospital this afternoon, Scotland Yard said.
A 42-year-old woman, believed to be the children's mother, was arrested on suspicion of murder and she remains in police custody.
More top news
Two women had to be rushed to hospital after the driver of a 'BMW' mounted the pavement in a hit-and-run crash.
The shocking moment a cyclist was threatened by a driver with a metal baseball has been captured on a video posted online.
Music festivals and big sporting venues put on on “high alert” - one of Britain's most senior anti-terror police officers has revealed.