Every mass casualty incidents report published for Arlington Heights, Illinois, newest first.
Chicago police said a 63-year-old man and a 48-year-old woman, both school custodians, were found with single gunshot wounds to the head inside Mark Twain Elementary School on Monday, Aug. 10, 2026. A suspect's status is listed as deceased.
Cook County Sheriff Thomas J. Dart identified the man charged with dissemination and possession of child sexual abuse material following a search warrant executed on June 16.
Police responding to reports of gunfire early on Friday, Sept. 23, found three of the victims outside a house in the Chicago suburb, according to The Associated Press.