At least six people were shot, including one fatally, at a Waffle House in Indianapolis early Monday morning.

Gunfire rang out at around 12:40 a.m. at the popular chain restaurant after two groups of people got into a fight, a spokesperson for the Indianapolis Metropolitan Police Department said.

One woman was critically wounded in the shooting and later died at the hospital, according to police.

Three men and another woman also suffered gunshot wounds and were transported to area hospitals in stable condition.

A fourth man, who arrived at a hospital by his own means, is in critical condition, police said,

The deadly incident spilled out of the packed Waffle House location, occurring both inside and outside the establishment.

Police are working to track down surveillance footage as well as witnesses. Authorities said the breakfast joint on the southwest side of the city was jam-packed when the shooting started.

“Preliminarily, detectives believe this incident started with a disturbance between two groups that escalated to gunfire,” Lt. Shane Foley said in a statement to The Post. “It is not clear at this point if any of the people injured were also individuals who fired shots. That will be part of what detectives will attempt to determine.”

There were no arrests as of early Monday.

Indianapolis was teeming with visitors as the city played host over the last few days to the NBA’s All-Star weekend that concluded Sunday night.