A second day of deadly tornadoes has seen 21 people die across the southern and central US, including one person in Elvis Presley's birthplace in Mississippi.
The city of Tupelo, home to 35,000 people, suffered power outages and extensive damage to homes and businesses.
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The statement comes after President Donald Trump cancelled his planned summit with Kim Jong Un.
Sophie Lionnet’s devastated parents say the killers “do not deserve to live”.