A young girl told her family "something's happened" shortly before her best friend was found dead along with her entire family.
The bodies of 11-year-old Maja Wlodarczyk, her dad Michal , 39, mum Monika, 35, and brother Dawid, three, were discovered at their flat in west London on Friday.
Police forced entry to the upstairs property on Staines Road, Bedfont but nothing could be done to save the family.