A man trying to sell a ring fired a shot during a robbery attempt outside Boulder Station late Thursday, but no one was injured, Las Vegas police said.

Boulder Station hotel-casino on Friday, May 5, 2017, in Las Vegas. Brett Le Blanc Las Vegas Review-Journal @bleblancphoto

Boulder Station in Las Vegas. (Loren Townsley/Las Vegas Review-Journal) @lorentownsley

Boulder Station hotel-casino on Friday, May 5, 2017, in Las Vegas. Brett Le Blanc Las Vegas Review-Journal @bleblancphoto

A man trying to sell a ring fired a shot during a robbery attempt outside Boulder Station late Thursday, but no one was injured, Las Vegas police said.

A man was meeting with a prospective buyer about 10 p.m. in the parking lot of the casino-hotel, 4111 Boulder Highway, but decided to call off the transaction when several other people showed up, Metropolitan Police Department spokeswoman Laura Meltzer said.

When one of the parties pointed a gun and attempted to rob him, the ring seller told police he pulled out his own gun and fired a shot in self-defense. The robber and several other people fled, but no one was injured, Meltzer said.

The ring seller had a permit to carry a concealed weapon, Metro Lt. Chris Holmes said.

The investigation is ongoing.

Las Vegas Review-Journal Max Michor contributed to this report. Contact Mike Shoro at mshoro@reviewjournal.com. Follow @mike_shoro on Twitter.