Manhunt Expanding Outside of Chicago for 3 Cop Killers

Families told to stay inside, schools closed as police and authorities look for suspects considered armed and dangerous.
2:25 | 09/03/15

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Transcript for Manhunt Expanding Outside of Chicago for 3 Cop Killers
We begin with the urgent search outside Chicago. At least 100 investigators now moving in, staking out rooftops. The search growing for three suspects. The images of the all out hunt these past 24 hours, helicopters searching by air. Now they fear the suspects might have slipped away. After an officer, a 32-year veteran, a father of four was killed in cold blood. His nickname was G.I. Joe. Moments ago, that chilling new clue of the officer's final call. ABC's gio Benitez outside Chicago tonight. Reporter: Tonight, the suspects still at large. New audio appears to capture gliniewicz's last call from this isolated back road. It all started just before 8:00 A.M. Tuesday. Lieutenant gliniewicz reported seeing the three suspicious men. Gliniewicz says he is pursuing them on foot into a swamp area and moments later calls for back-up. Send everyone you possibly kind of surveillance video they can get their hands on? Reporter: That's right, David. They want to see if they could see the men before the crime or after the crime. They have video right now, but we're told they haven't been able to spot those men anywhere on those recordings. A challenge ahead, David. Gio Benitez with us live tonight. Thank you. We also have a major

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