Detectives are investigating an attack on two other people in the same London street where a woman was believed to have been beheaded. Police said that they believed both were able to get out of a house in Nightingale Road, Edmonton without injury.
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Six people have been killed and a seventh is critically injured after a multi-vehicle crash in Birmingham in the early hours of Sunday.
It will be a frosty start for many across the UK with slow-clearing mist and fog across parts of central and southeastern England.
The prime minister says she has proven the "doubters" wrong but still faces opposition from both sides of the Brexit line.