On August 7th 2017 at about 0328 AM an officer with the Joplin Police Department stopped a truck pulling a trailer at 4th and Sergeant for not having trailer lights. Two occupants of the vehicle were contacted. As another officer arrived and exited his vehicle, an occupant of the truck threw an explosive device out the window that immediately exploded.
The truck then fled the area. Officers immediately began a pursuit of the suspect vehicle. At E Street and Sergeant, an occupant of the vehicle threw a second explosive device out of the vehicle, causing a second explosion.