ST. LOUIS COUNTY, Mo. – Detectives with the St. Louis County Police Department’s Bureau of Crimes Against Persons believe an overnight shooting that claimed the lives of two teenagers was, in fact, a murder-suicide.

According to Sgt. Tracy Panus, a county police spokeswoman, the shooting occurred around 12:50 a.m. in the 9400 block of Olive Boulevard, approximately a mile west of Interstate 170.

Officers from the Olivette Police Department responded to a call of a shooting. When canvassing the area, officers heard an additional gunshot and believed someone was shooting at them. Officers put out an “officer in need of aid” call.

Police from multiple agencies responded to the scene, including officers from Clayton, Shrewsbury, Rock Hill, and the North County Police Cooperative.

A short time later, Panus said police found a 16-year-old dead in a nearby field and an 18-year-old dead inside an apartment building. Both teens had suffered gunshot wounds.

Investigators determined the 16-year-old and 18-year-old got into an altercation in the apartment building. The 16-year-old allegedly shot the 18-year-old, then walked outside the building to a nearby field, and shot himself.

Panus said the investigation is still ongoing.