Two boys aged 14 and 15 are still being questioned by police investigating the murder of an 85-year-old woman in Greenford.
Paula Castle was mugged in an alleyway beside a primary school on Monday afternoon.
She died in hospital the following day.
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Patrick O'Leary, 46, mugged the 70-year-old charity collector outside her home, also stealing her handbag and cash.
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The Queen approved the nomination to succeed the Rt Rev Richard Chartres in the Church's third most senior position.