BALTIMORE —The Baltimore City Police Department has launched an internal investigation after a WBAL-TV 11 News viewer shared four photographs of a sign inside a city police wagon. The photos show the doors of the parked police van left open. On the inside of the back door is a sign, attached or possibly stenciled on, that reads: "Enjoy your ride, cuz we sure will!" The pictures were taken Tuesday near the Central District Police Station on Baltimore Street.