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.
More top news
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.
The Westminster terror attack dominates the front pages of Thursday's newspapers.
A timeline of exactly what happened.