Handgun, silencer and 'manifesto' among items in Luigi Mangione's backpack during arrest

Items found in Luigi Mangione's backpack when he was arrested in Pennsylvania last year include a handgun, a silencer, a magazine with bullets wrapped in underwear and a red notebook that an officer called a "manifesto."Monday kicked off the second week of a complex pretrial hearing in Manhattan criminal court where the moments leading up to the 27-year-old's arrest for the alleged murder of United CEO Brian Thompson were discussed.