CINCINNATI (Deb Dixon) -- Car theft reports are piling up in the city.Almost all of the car theft reports filed in Cincinnati over the past week say motor running keys left in car. It has happened outside fast food restaurants, gas stations and homes. Keep the car running, get it warmed up, it will just take a minute. What could happen? Ask Christopher Walker who went inside Bond Hill gas station while filling up on Monday. Another gentleman who was getting gas as well came in and told me whoever was driving the white car the car was stolen. The Cincinnati Police sign warning people to never ever leave their car running is in the window now and the warning is going to be in businesses all over the city next week. Friday morning Officer Gene Seay put them on door knobs on California Avenue.Captain Neville says he's concerned about what could happen when police spot one of the stolen cars and try to stop the thief.We go to stop them, it's that fear that they'll panic instead of pulling over saying I'm sorry here's your car back. It's flooring it, running from us. Most of the thefts are from private driveways and outside homes. No one is getting cited but it is illegal to keep cars running on private or public property.