Videos a focus of probe into Illinois policeman's slaying

New Video Could Reveal Clues in Murder of Illinois Cop

Investigators in northern Illinois on Friday pieced together several videos to build a visual timeline around the fatal shooting of a veteran policeman while a $50,000 reward was offered for information leading to the apprehension and conviction of the culprits.

Hundreds of law enforcement officers for a fourth day searched the region of Fox Lake, located about 60 miles (97 km) north of Chicago near the Wisconsin border, for three men suspected in the Tuesday's shooting of Fox Lake police Lieutenant Charles Joseph Gliniewicz, 52.

The videos come from various sources, including transportation department cameras at nearby traffic intersections, businesses and residences, Lake County Major Crime Task Force Commander George Filenko told a news conference.

See related images of the Illinois manhunt:

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Illinois Manhunt, Fox Lake Police Lt. Charles Joseph Gliniewicz
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Videos a focus of probe into Illinois policeman's slaying
FOX LAKE, IL - SEPTEMBER 02: Residents and police from Fox Lake and surrounding communities attend a vigil for slain Fox Lake police officer Lt. Joe Gliniewicz on September 2, 2015 in Fox Lake, Illinois. Gliniewicz was shot and killed yesterday during a foot chase with three suspects who remain at large. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 02: Officers salute as the family of slain Fox Lake police officer Lt. Joe Gliniewicz arrive for a vigil held in his honor on September 2, 2015 in Fox Lake, Illinois. Gliniewicz was shot and killed yesterday during a foot chase with three suspects. (Photo by Scott Olson/Getty Images)
Police officers meet up before heading out for a manhunt on Tuesday, September 1, 2015 in Fox Lake, Ill. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers get get a break after coming off a search mission as temperatures exceeded 90 degrees during a manhunt for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in the shooting death of an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: A police sniper keeps watch from the roof of a home while other police search nearby for suspects involved in the shooting of an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: A police officers looks out across a search area as the manhunt continues for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Sisters Brittany (L) and Renee Evans join other residents in showing their support as the manhunt continues for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: A police officer searches an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
A sniper and a lookout stand on top of a roof searching for two men following the killing of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
Police officers search for suspects after a police officer was shot on Tuesday, September 1, 2015 in Fox Lake, Ill. (Joe Shuman/Chicago Tribune/TNS via Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in the shooting death of an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: A police officer cools down his search dog as temperatures exceeded 90 degrees during a manhunt for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
Police officers patrol a swampy area where a manhunt is taking place on Tuesday, September 1, 2015 in Fox Lake, Ill. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
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"They all come together chronologically," Filenko said of the videos. "They are not separate, they are not independent. They are different cameras that are putting the story line together."

Motorola Solutions Inc pledged a $50,000 reward for the apprehension and conviction of offenders. A company representative told the news conference that several of its employees live in the area.

Given the remote location of the crime, authorities said they believe the suspects, described as two white men and one black man, are from the area and may still be nearby.

"Individuals are more comfortable hiding in place," Filenko said. "That is what we are hoping for, that they are still in this area and still within our reach."

Police are asking schools and business to check their records for people who were absent when Gliniewicz was shot, Filenko said.

"We have a mission here and we're focused and we'll keep going until we solve this case," he said.

Gliniewicz's .40-caliber handgun was found near his body, Filenko said, declining to disclose how many times, if any, it was fired or whether the weapon was used to kill officer.

Investigators have examined more than 100 leads, Filenko said. Officials established a phone line and website for tips.

A public viewing and funeral service for Gliniewicz have been set for Monday at Antioch High School in Antioch, Illinois, the sheriff's office said.

(Reporting by Suzannah Gonzales in Chicago and Brendan O'Brien in Milwaukee; Editing by Will Dunham)

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