Massive Manhunt Underway for Alleged Illinois Cop Killers

Veteran officer Lt. Joe Gliniewicz was shot in the line of duty.
2:16 | 09/02/15

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Transcript for Massive Manhunt Underway for Alleged Illinois Cop Killers
We begin with the manhunt under way as we come on the air tonight. A police officer, a father of four, shot and killed in suburban Chicago. The FBI, the U.S. Marshals on the scene. You can see the officer there on the train tracks searching tonight. Authorities going door to door. Police dogs searching for a trail. This veteran officer killed in the line of duty after a routine traffic stop turned deadly. There are now three suspects at large, considered armed and dangerous. Dramatic images coming in from the scene, helicopters searching from above for hours. On the ground, swat teams positioned on rooftops. They are warning neighbors to be vigilant. Reporter: Tonight, a massive manhunt underway for three armed and dangerous suspects after 30-year veteran police officer Joe gliniewicz was shot and killed. Special attention, fox lake surrounding area units, officer safety, man with gun. Reporter: Just before 8 A.M. Gliniewicz reported seeing three suspicious people in suburban fox lake, Illinois, 55 miles north of Chicago. Authorities say gliniewicz radioed in to say he was chasing the three men on foot, before losing contact. A male white and a male black fled from scene, taking the officer's sidearm and pepper spray. Shots were fired, unknown direction of travel. Reporter: The suspects, two white men and one black man, on the run. The sheriff's department scrambles resources, and when they arrive on the scene, they find gliniewicz with a gunshot wound. Send everybody you possibly can, officer is down. Reporter: Gliniewicz, nicknamed "G.I. Joe," was a married father of four. Today, not only did fox lake lose a family member, I lost a very dear friend. Reporter: All day schools placed on lockdown, train service stalled, as S.W.A.T. Teams swept the neighborhood from above, and on the ground, canine units scouring back yards and nearby woods. Authorities warning residents to be vigilant. We're asking for residents in the fox lake area to be on alert if they see anything suspicious. Dial 911 immediately. No tip is too small. Reporter: David, tonight officers from all over are extending their con Dell enss to the gliniewicz family saying they are forever indebted to him for his service. Now to another developing

This transcript has been automatically generated and may not be 100% accurate.

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