Police in Berwyn, Ill., are investigating a shooting that occurred outside a middle school in the Chicago suburb. File Photo by Justin Lane/EPA-EFE

Sept. 16 (UPI) -- Three people are dead in the aftermath of a shooting Tuesday that occurred near a middle school in a Chicago suburb.

Berwyn police described the incident in a press statement as a "domestic-related" shooting that occurred outside of Lincoln Middle School. Police have released few other details about the incident, which comes less than a month after a gunman opened fire near a school in Minneapolis.

Officers in Berwyn heard gunfire shortly after 4 p.m. CDT near Lincoln Middle School, where they saw a man firing a rifle into another vehicle, the press statement said.

The man then opened fire on the officers, who took cover and did not return fire, police said. The nearby middle school went into "an immediate hard lockdown" to protect students and staff, police said.