NASCAR drivers Ryan Newman (39) and Paul Menard (27) lead the field of cars to start the first of two Gatorade Duel auto races at Daytona International Speedway in Daytona Beach, Fla., on Feb. 17. John Raoux/AP
A view of the new track surface at the Daytona International Speedway is seen near the start/finish line prior to the start of the first of two Gatorade Duel auto races in Daytona Beach, Fla., on Feb. 17. John Raoux/AP
A statue of Dale Earnhardt Sr. rises above an entrance of Daytona International Speedway in Daytona Beach, Fla. The 10-year anniversary of Earnhardt's fatal accident falls on Feb. 18, just two days before the season-opening Daytona 500, NASCAR's version of the Super Bowl. Lynne Sladky/AP
Brad Keselowski (2) gives his brother Brian Keselowski (92) a helpful push to a fifth-place finish in the closing laps of the second of two qualifying auto races for Sunday's NASCAR Daytona 500, at Daytona International Speedway in Daytona Beach, Fla., on Feb. 17. Terry Renna/AP
Driver Kurt Busch (22) crosses the finish line ahead of Regan Smith (78) to win the first of two NASCAR Gatorade Duel races at Daytona International Speedway in Daytona Beach, Fla., on Feb. 17. Lynne Sladky/AP
NASCAR driver Jeff Burton celebrates in victory lane after winning the second of two Gatorade Duel auto races at Daytona International Speedway in Daytona Beach, Fla., on Feb. 17. John Raoux/AP
Kurt Busch poses with the trophy after winning the first of two qualifying races for Sunday's NASCAR Daytona 500 auto race, at Daytona International Speedway in Daytona Beach, Fla., on Feb. 17. Terry Renna/AP
NASCAR drivers AJ Allmendinger (43), Mark Martin (5) and Kevin Harvick (29) drive in close proximity to one another during practice at Daytona International Speedway in Daytona Beach, Fla., on Feb. 16. John Raoux/AP
Race fans write wishes and sign their names at the start/finish line on the newly paved track surface of the Daytona International Speedway prior to start of the first of two Gatorade Duel auto races in Daytona Beach, Fla., on Feb. 17. John Raoux/AP
Dale Earnhardt Jr. looks on during the playing of the national anthem before the start of the first Gatorade Duel 150 NASCAR Sprint Cup qualifying race for the Daytona 500 at the Daytona International Speedway in Daytona Beach, Fla., on Feb. 17. Joe Skipper/Reuters
NASCAR Sprint Cup Series driver Jeff Gordon smiles back toward a fan after climbing out of his number 24 car after qualifying to start in the front row of the Daytona 500 at Daytona International Speedway in Daytona Beach, Fla., on Feb. 13. Dale Earnhardt Jr. qualified for the pole position while Gordon finished with the second fastest time. Brian Blanco/Reuters
NASCAR Sprint Cup Series driver Dale Earnhardt Jr. (r.) and Jeff Gordon pose for a photo in Gatorade Victory Lane after qualifying to start in the front row of the Daytona 500 at Daytona International Speedway in Daytona Beach, Fla., on Feb. 13. Brian Blanco/Reuters
Riot police advanced on protesters in Istanbul's Taksim Square shortly after Prime Minister Erdogan warned the peaceful demonstrators to clear out or be forcibly removed.
Riot police fired water cannons and tear gas on protesters in Istanbul's Taksim Square and neighboring Gezi Park on Saturday, an intervention that came shortly after the prime minister warned that security forces "know how to clear" the area.
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