The Duchess of Cambridge met with Sir Ben Ainslie and supporters of a bid to launch a British team in the sailing competition the America's Cup.
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An American service member and 20 South Koreans have tested positive.
Vice President Mike Pence has been put in charge of the domestic response to the virus.
The assailant was a 51-year-old Milwaukee man who died of a self-inflicted gunshot wound, police said.