Sgt. Pat Wyton said Casey Dane, a guard with a private firm called Colorado Security, and Harvey Epstein engaged in a heated argument behind Mamacitas restaurant, the Boulder Daily Camera reported Monday.

Epstein, a bartender at Mamacitas, was upset that his car had been booted for parking illegally and retrieved a set of bolt cutters to attempt to free his vehicle, Wyton said. He said Dane ordered Epstein to put down the bolt cutters because he felt threatened and told him he would shoot him with his Taser weapon if he did not comply.

Wyton said the guard "decided to shoot the guy," not knowing that Epstein was wielding the same type of Taser.

"They shot each other," Wyton said. "It was just kind of a bone-head deal."

He said neither man required medical attention.

Epstein was arrested on suspicion of felony menacing and use of a stun gun, Wyton said. He was taken to the Boulder County Jail.