At least three people have been killed during a shooting at a Walmart in Oklahoma, according to reports from local media citing law enforcement.

The death toll was confirmed to ABC7 by Duncan Police chief Danny Ford, who said that the three people were killed outside the store near a vehicle.

One of those killed was the shooter, he said. Several more were reportedly injured in the shooting.

“We have three individuals that are deceased. We have two white males and a white female,” Mr Ford said, according to Fox25. “Two of the victims are inside a vehicle, one is outside the vehicle. And at this point that’s about all we do know.”

The shooting apparently involved a handgun, and the police department has begun an investigation into the circumstances surrounding the shooting.

Texas mass shooting: Two killed in attack at homecoming party Show all 10 1 /10 Texas mass shooting: Two killed in attack at homecoming party Texas mass shooting: Two killed in attack at homecoming party Two people have been killed and at least a dozen injured in a mass shooting at a university homecoming party in Texas EPA Texas mass shooting: Two killed in attack at homecoming party Hundreds of students were gathered at The Party Venue in Greenville, near Dallas, to celebrate the start of a new term at Texas A&M Commerce College EPA Texas mass shooting: Two killed in attack at homecoming party Halloween masks litter the ground at the scene where the deadly shooting took place AP Texas mass shooting: Two killed in attack at homecoming party With 750 people in the building, someone with a semi-automatic rifle opened fire The Dallas Morning News via AP Texas mass shooting: Two killed in attack at homecoming party Deputies were already at the scene due to a parking complaint when they heard gunshots coming from the back of the building, chief deputy of Hunt County Sheriff’s Department, Buddy Oxford, told reporters The Dallas Morning News via AP Texas mass shooting: Two killed in attack at homecoming party A single shoe and a costume hat rest on the ground AP Texas mass shooting: Two killed in attack at homecoming party Officials work at the crime scene The Dallas Morning News via AP Texas mass shooting: Two killed in attack at homecoming party Bodies are removed from the Party Venue EPA Texas mass shooting: Two killed in attack at homecoming party Officials work a crime scene The Dallas Morning News via AP Texas mass shooting: Two killed in attack at homecoming party Chief Deputy Buddy Oxford of the Hunt County Sheriff's Department addresses members of the media The Dallas Morning News via AP

Schools in the Oklahoma city have been placed on lock down until they get an all clear from law enforcement.

Duncan is the county seat of Stephens County, and had a population of 23,431 the last time the Census was conducted, in 2010.

The city is located roughly 50 miles southeast of Oklahoma City.