Millcreek Township police Chief Thomas Carlotti isn't naming the officers or saying how they were disciplined, but says they haven't lost their jobs.
The weeklong 27th annual National Tactical Officers Association conference began Sept. 19th at Pittsburgh's convention center.
Millcreek officers traveled to the conference in five unmarked cars, but returned in only four vehicles. The fifth wasn't discovered missing for about three weeks. The Erie Times-News says the 2006 white Ford Crown Victoria had somehow been left behind in a motel parking lot.