Police are searching for the driver of a dark-colored sedan who hit and injured an 83-year-old man in Brooklyn, leaving him in critical condition. Police said the hit-and-run happened Saturday afternoon in Park Slope at the intersection of Sixth Avenue and Union Street. The pedestrian was walking through the crosswalk when the sedan's driver came barreling down the street around 2:30 p.m. Investigators said the driver of the sedan was going west on Union Street when they hit the man and kept going down the road. Click here to read more on nbcnewyork.com.