Authorities say a former NASCAR crew member broke the jaw of a team owner while they were arguing at Dover International Speedway.

A news release from Dover police says 33-year-old Lawrence Hayden of Concord, North Carolina, and 56-year-old NASCAR Xfinity Series race team owner Jerry Hataway were arguing over Hayden's employment Friday when Hayden began punching Hataway.

Hataway was treated at the track before being taken to a hospital with a broken jaw.

Hayden was charged with second-degree assault and issued a $500 secured bond. It isn't clear if he has a lawyer.

Dover is hosting the OneMain Financial 200 XFINITY Series race Saturday, followed by the AAA 400 Drive for Autism Monster Energy NASCAR Cup Series race Sunday.