Barack Obama will travel on Sunday to Newtown, Connecticut, the site of the deadly elementary school shooting.
He is expected to meet with families of the victims and will speak at a service.
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A 25-year-old man has been arrested in Newport, South Wales, in connection with the Parsons Green terror attack, Scotland Yard said.
A milder night ahead with some cloud low enough to be misty in places.
Tata Steel and Thyssen Krupp will formally announce the merger of their European steel operations on Wednesday, ITV News understands.