According to a report on the Guardian website, a 43-year-old woman has been arrested in connection with the deaths of three young children in London.
Police were called to the address in New Malden late on Tuesday and found a girl, aged 4 and twin 3-year-old boys dead.
It is believed that the children had genetic disorders, but an older child is unharmed.
The Daily Mail reported that the father of the children, an investment banker, was believed to have been out of the country at the time with the couple's eldest child, aged 8. They were reportedly on their way back to the UK, where the family had been living for the last 15 years.
British police have declined to release any further details of the case but said that they are not looking at any other suspects.
"A 43-year-old woman has been arrested on suspicion of murder and remains in custody at a south London police station," the Metropolitan Police told AFP.
"Detectives are not looking for anyone else in connection with this incident at this time."