Nightly news with lester holt. Good evening. In what has already been an especially perilous year for Law Enforcement the shooting death of a Police Officer in illinois today touched off a massive manhunt in the air and on the ground. It happened well north of chicago in the community of fox lake. The veteran Police Lieutenant was shot during a foot chase and was found stripped of his weapon. Schools were locked down and people told to stay indoors as police swarmed the area in search of the suspects. It comes as Police Fatalities nationally from all causes are rising dramatically. Nbcs john yang is near the scene in fox lake with late details. Reporter from the air and on the ground a massive intensive manhunt for the killers of a veteran Police Officer. S. W. A. T. Teams, canine units all closely searching nearby wooded areas, local businesses and homes. The suspects are considered armed and dangerous. Theyre being described as two male whites and one male black. We have the evidence