President Barack Obama has boarded Air Force One bound for Connecticut to attend a church vigil and to meet families of victims of the school shooting in Newtown.
He will also talk to members of the emergency services.
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A man and woman have been arrested on suspicion of murder after a badly burned body was found in a garden in Southfields, south-west London.
Kim Jong-un has called Donald Trump "deranged" and says he will "pay dearly" for his threats, according to North Korea's state news agency.
Theresa May will tell European counterparts their shared political legacies depend on agreeing a good Brexit deal.