ELKHART, Ind. (WOWO): Indiana State Police continue to investigate several different avenues to try to determine a motive in the tragic shooting that happened Wednesday night at the Martin's Super Market in Elkhart. Over the next several days, state police will interview dozens of family, friends, and acquaintances of those involved in the incident. Officers are reviewing autopsy findings and analyzing the video footage from the store. And they say they will delve into the background of Shawn Bair. The state police are working with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) to track down the origin and ownership of the gun.