Officials in the United States say the surviving suspect in the Boston bombings has acknowledged his role in the attacks. However it is unclear whether the admission could be used at a criminal trial because it happened before authorities advised Dzhokhar Tsarnaev of his constitutional rights.
It is also unclear whether prosecutors would need the admission by Dzhokhar Tsarnaev to secure a conviction because physical evidence has already been uncovered in the investigation.
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Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.