Fans are receiving medical treatment after at least ten cars crashed into each other during the Daytona Speedway, causing debris to fly into the stands.
Reports differ on the number of spectators injured as a result of the accident which took place before NASCAR's main event the Daytona 500.
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Friday will be a much calmer day for many, with the weather set to remain dryer with sunny periods and much lighter winds than on Thursday.
Teachers and managers in particularly are putting in hundreds of hours of overtime free of charge.