A suspected drunk driver plowed into six people — including three children — during a Halloween event outside a Brooklyn NYPD precinct, cops and sources said. The 56-year-old motorist lost control of his black sedan around 4 p.m. and mounted the curb — hitting the victims at the “Trunk or Treat” event outside the 83rd Precinct stationhouse on Knickerbocker Avenue near Bleecker Street in Bushwick, police said. He also struck a private ambulance stationed outside for the event, authorities said. A 31-year-old woman and her two daughters, 6 and 11, were taken to Bellevue Hospital; an 8-year-old boy and 74-year-old woman were rushed to Wyckoff Heights Medical Center; and a 53-year-old woman was brought to the Elmhurst Hospital Center, according to the NYPD. All six were listed in stable condition, cops said. The driver was taken into police custody, where he is undergoing an alcohol breathalyzer test, sources said.