Former British newspaper editor Piers Morgan, who is now a TV host for US network CNN, said he has become "increasingly angry" at the number of Americans killed in gun murders.
"In Britain we have between 30 and 50 gun murders a year," he explained. "In America they have 11-12,000 murdered with guns every year. Another 18,000 people kill themselves with guns every year."
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The prime minister has said the debate over Britain's EU membership has affected his long-term friendship with the mayor of London.
Tonight a band of cloud and rain will spread into Scotland and Northern Ireland.