Police Go Door-to-Door Outside Chicago Looking for Cop Killers

Authorities looking at a new piece of video and following leads for a possible break in the case.
1:40 | 09/04/15

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Transcript for Police Go Door-to-Door Outside Chicago Looking for Cop Killers
The one holdout, Davis' son. Alex Perez in king news tonight, you'll see the showdown, the count clerk now hauled off to jail. Tonight that clerk behind bars afr refusing to grant marriage licenses to gay couples.losive moments inseid the clerk's office, and tonight the strong reaction coming in outside. Also there. In his last recorded call, he said he was chasing two white men and one black man. They could've run across this field over these railroad tracks and riefth into the view of a home surveillance camera right into this neighborhood. There is a good probability that they are still somewhere in Reporter: Tensions are high here. Overnight, a woman made a false report that she saw two men running. Helicopters were launched and 140 officers scoured the area. There as gliniewicz's widow delivers an emotional message to the community. Joe was my best friend my world, my hero. He will truly be missed by all of us. Reporter: And David, we've learned tonight that the lieutenant's gun was found at the crime scene. Police won't say much more than that David, other than 100 officers are still working on the case. David.

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

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