Friday's game was between Lee's Summit North and crosstown rival Lee's Summit High.
Childs says the suspect had been seen with a weapon earlier and was caught fleeing from the area.
Two off-duty officers working the game were checking into a reported disturbance, then heard a gunshot.
No injuries were reported. But police were checking hospitals to make sure no one had been shot.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or firstname.lastname@example.org.