Cincinnati police are investigating a string of car break-ins in the Walnut Hills area.New video shows how thieves smashed into cars, leaving neighbors to deal with cleanup and repairs.Police say these incidents happened over the weekend. There were nine reported car break-ins at multiple apartment complexes in Walnut Hills.Steven Harrison owns mobile glass repair business, Glass and Go. He spoke about this concerning trend."In the last three to four months, I mean, we've had a ton of calls.