Ron Klein

Courtesy of Lyft

(Updated at 4 p.m., Mon., April 21)

A St. Louis judge has told a new ride share service that it must halt its operation in the city and county.

The St. Louis Metropolitan Taxi Cab Commission sued "Lyft" last week for entering the region’s market without registering.

Lyft allows customers to summon drivers using an app on their cell phones. Once the ride is over, customers pay the driver through credit card information stored within the application.