NASCAR driver killed in New Jersey race crash June 13, 2013 -- Updated 0519 GMT (1319 HKT) Jason Leffler signs autographs before a NASCAR race last year. NEW: Fellow drivers mourn Leffler's death He was taking part in an event for sprint cars The race was not a NASCAR-sponsored event (CNN) -- NASCAR driver Jason Leffler died Wednesday after he crashed his car at the Bridgeport Speedway in New Jersey, NASCAR said. He was 37. Leffler was taking part in "Night of Wings," a 25-lap event for sprint cars with a $7,000 prize. The race was not a NASCAR-sponsored event. Sprint cars are high-powered cars that usually run on dirt or paved oval tracks. "NASCAR extends its thoughts, prayers and deepest sympathies to the family of Jason Leffler who passed away earlier this evening," NASCAR said in a statement. For more than a decade, Jason was a fierce competitor in our sport and he will be missed. In March, another crash involving a sprint car killed two people at Marysville Raceway Park, outside Sacramento, California. Soon after Leffler's death was announced, condolences poured in from fellow drivers. Deeply saddened by the passing of @JasonLeffler tonight. Please keep his family in your thoughts and prayers," tweeted Kyle Bush. Another driver, Bobby Labonte, said in a Twitter post, "Lost a good guy tonight in Jason Leffler. Prayers with your family! "My thoughts and prayers are with Jason's family and friends," Jeff Burton posted. Breaks my heart thinking of his little boy. June 13, 2013 -- Updated 0330 GMT (1130 HKT) Check out these old photos of the hair-raising flight path that required pilots to navigate between densely-packed apartments. June 7, 2013 -- Updated 1707 GMT (0107 HKT) CNN received more than 1,000 iReports from Turkey in less than a week from Turks compelled to document, protest and demand their voices be heard. June 13, 2013 -- Updated 0111 GMT (0911 HKT) Scenes of violent clashes between protesters and police may make visitors to Istanbul think twice. Is it time to cancel your trip? Extraordinary girls, through the power of education, can change the world. iReporters share their thoughts on what they would tell girls about education.