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.
More top news
Hackney's Idris Elba could become the next James Bond, it has been reported.
Hollywood legend Joan Collins OBE brought some much needed Christmas cheer to families supported by children's hospice Shooting Star Chase.
London mayor Boris Johnson is backing Olympics supremo Seb Coe as his replacement.