Authorities in Las Vegas, Nev., are investigating a shooting that took place in a parking structure outside a movie theater that left two people critically wounded and one person with a minor injury.

According to the police, the shooting, which took place just after midnight on Wednesday, does not appear to be random. Officer Laura Meltzer told the Associated Press that, while the shooter has not yet been identified, initial reports that cite the theater lobby as the location were incorrect.

"The theater had nothing to do with it," Meltzer told the Associated Press. "They were not coming from a movie. It was not in the theater lobby."

Investigators believe the shooting came as a result of an ongoing conflict between members of two groups that squared off in the parking structure near the UA Showcase 8 theater. The parking structure lobby has entrances to the theater and to Las Vegas Boulevard, the AP reports.

Reports indicate that the police responded to the scene, where they found one of the more seriously wounded people in the parking structure lobby and another in an elevator car on the fifth floor of the six-story parking structure. Both are reportedly in critical condition at University Medical Center in Las Vegas.

In addition, a third victim was discovered near the street in front of the elevator lobby. Meltzer told the AP that, while he was treated at the scene of the shooting, the victim’s injuries did not appear to be life-threatening.

The police don’t believe the confrontation between the two groups was gang-related, but they were still trying to determine the relationship between them.

The police and property security officers closed exits and entrances to the Showcase Mall parking structure for more than two hours while they investigated, the police spokeswoman told the AP.