UPDATE MARCH 15: NASCAR has decided to not penalize or fine Kyle Busch for last weekend's incident.
NASCAR says there was a full review of the incident, including discussions with both Busch and Joey Logano and their respective race teams.
Executives say both are clear on behavior expectations going forward.
Kyle Busch duked it out with Joey Logano after the Kobalt 400 on Sunday at the Las Vegas Motor Speedway.
According to ESPN, it appeared that Logano bumped into Busch's car while trying to avoid Brad Keselowski during the final lap of the race. Busch went into a spin and ended up on pit road.
Busch hopped out of his wrecked car after the race, then stormed over to Logano and punched him in the face. Logano's crew piled on top of Busch before officials broke up the fight. Busch left with a fat lip and a bleeding forehead.
Martin Truex Jr. claimed the checkered flag and was celebrating with burnouts on the track while the fight took place.
WARNING: The video below contains strong language.