Yes. Prior to the shooting, a diversionary bomb exploded on the east side of the greenbelt field near the 7900 block of South Wadsworth Boulevard between Ken Caryl and Chatfield Avenues (pretty close to Eric’s house). The Jefferson County Sheriff’s Office was notified of the explosion at 11:21 a.m. The Littleton Fire Department responded and West Metro Fire Department Investigator Bill Maron completed the investigation. The investigation revealed that two backpacks containing explosive diversionary devices, built with multiple components, had been placed at this location by E & D. Only some of the components actually exploded.
The examination of the diversionary devices by bomb technicians provided immediate critical information about the sophistication of the devices and the possibility of motion activators attached to the bombs. That information was relayed to the command post, the SWAT teams and the bomb technicians responding to the scene at the high school. See map here.

