MIAMI BEACH, Fla. -- Team owner Richard Childress said Monday that his team was still uncertain what caused a pit-road explosion that blasted the No. 27 Chevrolet driven by Paul Menard in the late stages of Sunday's NASCAR Sprint Cup Series finale at Homestead-Miami Speedway. "No, never have," Childress said Monday at a luncheon before the awards ceremony for NASCAR's Nationwide Series and Camping World Truck Series. Childress said his team would investigate the incident back at its Welcome, N.C., race shop and report its findings to NASCAR's research and development department. Robin Pemberton, NASCAR's vice president of competition, spoke with Childress and seconded the team owner's opinion on the violent impact. More...