Police in Kansas City, Missouri, say at least two people are dead and 15 people were reportedly injured in a shooting outside a bar where they were going to celebrate the Chiefs making it into the Super Bowl.

The shooting took place shortly before midnight Sunday, Kansas City police said.

Capt. David Jackson told news outlets at the scene that responding officers found "a chaotic scene" and had to call in help from around the city.

A man and a woman were found dead.

Police believe the shooter is the deceased man, Jackson said in a statement.

The shooter opened fire on a line of people waiting to enter a bar, but the motive for the shooting wasn't immediately clear, police said.

A gunman was reportedly trying to get into a nightclub called 9ine Ultra Lounge when a fight occurred, Kansas City police officers said, according to Fox4KC.com.

The gunman opened fire and was eventually shot by an armed security guard, police said.

During the investigation, police heard that people -- at least 15 -- were showing up to local hospitals with injuries from the shooting. At least three people were in critical condition, police said.

The scene was near U.S. Highway 40. News outlets at the scene identified the bar outside which the shooting took place as 9ine Ultra Lounge.

A Facebook post on the club's page advertised Sunday night's "Sold Out Sundays" event, which appeared to be a celebration of the Kansas City Chiefs. The Chiefs -- featured on the event's artwork -- beat the Tennessee Titans on Sunday to advance to the Super Bowl.

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"It just put such a tragic end to such a wonderful day in Kansas City," Jackson County Prosecutor Jean Peters Baker said at the scene, referencing the win. "It's just hard to stand here and talk about this kind of tragedy on really one of the best days Kansas City has had in a long time."

The Associated Press contributed to this report

