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A murder investigation has been launched after a four-year-old boy died following a knife attack in east London.
Police were called to an address in Montague Road, Hackney, on Wednesday night following concerns about the welfare of a child.
Inside, officers found a four-year-old boy who had suffered knife injuries.
He was rushed to hospital but despite the best efforts of the emergency services, he later died from his injuries.
A 41-year-old woman, who was known to the boy, was arrested at the scene on suspicion of murder and remains in custody, the Met Police said.