Zac Clingenpeel/Sun-Times The South Chicago Police District is partnering with Operation Safe Pump in an effort to prevent carjackings outside grocery stores and shopping centers. South Chicago District Cmdr. Robert A. Rubio said officers will monitor parking lots and escort shoppers to their cars in areas with higher rates of carjackings. Rubio made the announcement outside Stony Island Plaza, at 95th Street and Stony Island Avenue, site of a carjacking two days earlier. The Operation Safe Pump and Safe Shop initiative, announced two weeks ago as Operation Safe Pump, is an effort by Early Walker, owner of W&W Towing, and the Kates Detective and Security Agency to combat a surge in carjackings throughout Chicago. Guards from the Kates agency have been posted at gas stations, mostly on the South Side, during busy times.