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A burning tire, left, flies toward spectators after a gasoline tank explosion resulting from a crash on fourth turn in second lap at Indianapolis Motor Speedway, Ind., Saturday, May 30, 1964. Dave MacDonald's Ford Thompson racer swerved into the inside wall, causing more cars to crash. MacDonald, in his first Indy 500-mile race, and Eddie Sachs, driving a Ford Hallibrand, died in the accident. The race was postponed for almost two hours. (KEYSTONE/AP Photo/Bob Daugherty)