Police investigation: Mechanical failure led to Jason Leffler crash, death

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Following more than a week-long investigation, New Jersey state police said the wreck that claimed the life of NASCAR driver Jason Leffler in a June 12 dirt track race in Bridgeport, N.J., was caused by a mechanical problem.

While the report is not fully completed, several findings have come to light to explain much of the reason why Leffler’s car suddenly went out of control and flipped several times before coming to rest. Leffler was taken to a nearby hospital but was pronounced dead less than an hour after the wreck, which occurred shortly after 9 pm ET.

Police believe a torsion stop, which is part of the sprint car’s suspension, somehow broke off and became lodged between a wheel and the steering control system, rendering the car uncontrollable. The car came out of the fourth turn, spun, then hit the outside concrete retaining wall, flipping several times before coming to a rest, as well.

While the report has not determined how fast Leffler was going when the crash occurred, the police report said cars were averaging 135 mph and as high as 150 mph on both straightaways during the course of the race.

The official cause of death, as determined by a local medical examiner, has been ruled blunt-force injuries to Leffler’s neck.

Leffler, 37, was buried Wednesday, one week after the tragedy. He leaves behind a five-year-old son. A trust fund for Leffler’s son has been established by several of Leffler’s fellow NASCAR drivers.

Longtime friend and mentor Tony Stewart, a three-time Sprint Cup champion who also co-owns Stewart-Haas Racing and owns or has partial ownership in several short tracks like the New Jersey facility, said last week in Michigan that the facility was not at fault.

“It was an accident,” Stewart said. “Just like if you go out and there’s a car crash. It’s an accident. Nobody as a track owner wants to go through what happened this week, but it’s not due to a lack of effort on their part to try to make their facilities as safe as possible under the conditions they have.”

F1 Paddock Pass: United States Grand Prix post-race (VIDEO)

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As Lewis Hamilton took another step towards his fourth Formula 1 World Championship Sunday at the United States Grand Prix at Circuit of The Americas, plenty of other topics of discussion emerged in the wake of Round 17 of the season from Austin.

Hamilton’s win came as his Mercedes AMG Petronas team claimed its fourth consecutive Constructor’s Championship, Scuderia Ferrari came up short once again despite a valiant effort in second and third, and Max Verstappen’s penalty after the race was the major talking point.

Elsewhere Valtteri Bottas struggled again, the Sahara Force India twins continued to pick up points, Carlos Sainz Jr. made a major positive impact in his first start with Renault, Brendon Hartley impressed on debut at Toro Rosso and Romain Grosjean and Haas F1 Team endured a tough weekend on Haas’ home soil.

Check out all the recap from the latest USGP in the latest post-race edition of the NBC Sports Group original digital series Paddock Pass with NBCSN pit reporter and insider Will Buxton, below.