In post-race inspection, NASCAR discovered a ride height violation on the No. 18 Toyota of Kyle Busch, who finished fifth in Sunday's Sylvania 300 at New Hampshire Motor Speedway.
The car measured below tolerances on the left front, according to NASCAR spokesperson Ramsey Poston. If penalties are warranted, they will be announced later in the week.
It was originally reported the No. 11 of chase contender Denny Hamlin was the offending car. This sent shock waves through the garage area and media personnel scurrying for information.
More on this developing story as details become available.
Source: Marty Smith and NASCAR