Joie Chitwood, president of the Daytona International Speedway, has said that Sunday's main race will go ahead despite the recent incident.
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The Pope's comments follow a failed missile test by North Korea and condemnation of that test by US president Donald Trump.
Joshua beat the older, more experienced boxer in front of 90,000 fans in Wembley Stadium.
Dry for most of the night. Rain in the southwest by dawn.