BEAVERCREEK, Ohio — Details are still unfolding after a gunman injured four people in a mass shooting at a Walmart in Beavercreek on Monday night before dying of an apparent self-inflicted gunshot wound. As police and federal agents continue to investigate the shooting, more information is expected to be released. The gunman entered the Walmart at 3360 Pentagon Blvd at 8:35 p.m. Monday and began shooting, injuring four people who were transported to area hospitals for treatment. The shooter died of an apparent self-inflicted gunshot wound.

Walmart employee reported hearing at least two shots, but did not witness anyone getting hit. Wright State University students Anna Cowley and Kailie Conley said they saw between 30 and 40 police cruisers with lights and sirens pulling up to the store.

The four adults injured in the shooting are in critical condition and one has non-life-threatening injuries. Three women and one man were injured. A CareFlight medical helicopter left the scene just before 10 p.m. for Miami Valley Hospital and the other three victims were transported to Soin Medical Center.

The identity of the shooter has not been released. The Ohio Bureau of Criminal Investigation, FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives are assisting Beavercreek police with the investigation.

The Beavercreek Walmart temporarily closed on Nov. 6 after a 15-year-old boy reportedly set a fire inside the business. The store reopened on Nov. 8, the same day the suspect was arrested. The teen is facing aggravated arson, vandalism and inducing panic, according to police. The Walmart is also the same store where a police officer shot and killed 22-year-old John Crawford III of Fairfield on Aug. 5, 2014. A 911 caller reported Crawford was pointing a weapon and threatening shoppers.