NYC Police Release Description of Shooter Captured on Video

Question: could you summarize "New York City police have released a description of the shooter and where he fled, based on video footage. “The shooter appears to be a light-skinned male. He’s wearing a light brown or cream colored jacket, a black face mask, black-and-white sneakers, and a very distinctive gray backpack,” NYPD Chief of Detectives Joseph Kenny said. Evidence shows the gunman “approaches the victim from behind and shoots him in the back.” “The shooter then walks toward the victim and continues to shoot. It appears the gun malfunctions as he clears the jam and begins to fire again,” Kenny said. He said the shooter then fled into an alleyway from West 54th Street to West 55th Street. “Once at West 55th Street, the shooter continues to walk westbound on Avenue of the Americas, where he gets onto an electric e-Citi bike and rides northbound on Avenue of the Americas toward Central Park, where at 6:48 a.m., we have the shooter riding this bike into Central Park at Center Drive. At the scene, we recover three live 9mm rounds and three discharged 9mm shell casings,” he continued." into 4 sentences