NASCAR has placed driver Robby Gordon on probation through the end of the season after an altercation with Kevin Conway in the garage at the Las Vegas International Speedway Friday night.

Conway, who was not penalized by NASCAR, filed a police report with Vegas police charging that Gordon threw punches at him. Conway drove for Robby Gordon Motorsports last season and Gordon claims that Conway owes him money.

NASCAR immediately placed Gordon on indefinite probation Saturday morning, pending the weekly NASCAR pow-wow on these types of issues each Monday morning. NASCAR decided the probation will now end on December 31.

Conway released a statement Monday night saying, "Robby Gordon, who has a long history of issues in NASCAR, decided to ambush me in the garage area at the Las Vegas Motor Speedway, completely unprovoked. Robby even confronted Joe Nemechek, my car owner, on pit road during Cup Series qualifying shoving him and telling him that he was looking for me and going to assault me. We have many witnesses including a crew chief that signed a police report documenting the truth of his physical attack on me."

Here is the official release from NASCAR:

DAYTONA BEACH, Fla. (March 8, 2011) – NASCAR announced today that Robby Gordon, driver of the No. 7 car in the NASCAR Sprint Cup Series, has been placed on probation until Dec. 31 for a rule infraction he committed March 4 at Las Vegas Motor Speedway.

Gordon was penalized for violating Section 12-1 (actions detrimental to stock car racing; involved in an altercation in the garage area with another competitor) of the 2011 NASCAR rule book.