The second of two sisters, who went missing on November 6, has now been found, police said today.
Appeals had been made for help in finding 11-year-old Kathleen Doherty from Greenford who had gone missing with her 14-year-old sister Biddy.
Kathleen was found today and returned to the care of the local authority. Biddy had been found earlier this week.
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Around 60 firefighters tackled the blaze at the four-storey building in Daleham Gardens, Hampstead, that broke out early on Tuesday.
It is the fourth time in five years that the London borough has topped the rankings, according to data from the ONS.
Catherine Burke's body was discovered at a house in a quiet street in Muswell Hill last Thursday evening.