New Jersey state police blamed a mechanical problem for the crash that killed NASCAR driver Jason Leffler last week, according to ESPN.
The police released some of its findings on Friday, but had not completed its investigation into the crash at Bridgeport Speedway in Logan Township on June 12.
The mechanical problem reportedly caused Leffler to spin out and slam into a concrete wall along the side of the track because he was unable to turn.
Though the report did not state how fast Leffler was driving, it did indicate that the cars in the dirt-track race were averaging 135 mph, including 150 mph on straightaways.
The cause of Leffler's death was attributed to blunt-force neck injuries during the crash.
Leffler, 37, won two races on the NASCAR Nationwide Series circuit.