An investigation has been launched following the deaths of man and a child in Notting Hill.
Shortly before 20:00hrs on Friday, 27 February officers from Kensington and Chelsea Borough attended an address in Colville Square, W11, following concerns for the welfare of occupants there.
After forcing entry to the address, officers found the bodies of a man, believed to be in his 40s, and a girl believed to be four-years-old.
Both were pronounced dead at the scene by London Ambulance Service.
The deaths are being treated as unexplained and the Homicide and Major Crime Command (HMCC) are investigating.
A woman in her 30s has been arrested in connection with the deaths and is currently in custody at a central London police station.
Formal identification has not taken place. We await further details on the exact ages of the deceased.
A post-mortem examination will be scheduled in due course. We are not discussing the nature of the injuries at this stage.
We are in the process of informing all next of kin.
At this early stage we are not looking for anyone else in connection with the deaths.
Anyone with any information can call police via 101 or contact Crimestoppers anonymously on 0800 555 111 or www.crimestoppers-uk.org.