INDIANAPOLIS — A shooting at a Waffle House restaurant in Indianapolis early Monday morning killed a woman and wounded five other victims, police said.

Officers responded to a report of a shooting at the restaurant on Lynhurst Drive around 12:30 a.m., the Indianapolis Metropolitan Police Department said in a statement.

Police found five victims with gunshot wounds who were transported to a hospital, including a woman who was in critical condition and died at the hospital.

The wounded victims included a woman and three men, who all were listed in stable condition.

A sixth man traveled separately to a hospital with a gunshot wound from the shooting and was listed in critical condition, police said.

Investigators believe an altercation between two groups of people at the restaurant escalated to gunfire. It was not immediately clear if any of the victims fired shots, police said.

No arrests were immediately made after the shooting as police continued to investigate.

Two police officers remained at the scene Monday morning as members of the Indianapolis-Marion County forensic services agency crime scene unit entered the building. Law enforcement took down police tape that barricaded the restaurant's parking lot around 10:30 a.m.

A spokesperson for Waffle House said the company is referring all questions about the shooting to local law enforcement.

“We are cooperating fully with the ongoing law enforcement investigation into this incident,” Njeri Boss, vice president of public relations, said in a written statement.