A third Ohio city is adding a audio-surveillance system to track gunfire.
Cincinnati is rolling out ShotSpotter technology this month.
In 2010, Youngstown became the first Ohio city to install the system. Canton followed in 2013.
ShotSpotter uses microphones to detect and pinpoint the sound of gunshots, which then sends an alert to dispatchers.
University of Virginia researcher Jennifer Doleac says the technology can improve response times.