Security video may provide lead in Illinois policeman's slaying

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Authorities in northern Illinois turned to a home security video on Thursday for possible clues about three suspects in the fatal shooting of a veteran policeman as hundreds of officers searched across the region for a third day.

The video, turned in Wednesday night by a Fox Lake homeowner from near where the shooting occurred, was being processed by the U.S. Department of Homeland Security, Lake County Major Crime Task Force Commander George Filenko told a news conference.

Filenko said the task force expected results back from the video as soon as Thursday evening. He said officials believed the video was "significant."

See images of the Illinois manhunt:

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Illinois Manhunt, Fox Lake Police Lt. Charles Joseph Gliniewicz
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Security video may provide lead in 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 officials follow Fox Lake Police Lt. Charles Joseph Gliniewicz's family after a vigil at Lakefront Park to honor him on Wednesday, Sept. 2, 2015, in Fox Lake, Ill. Gliniewicz was shot and killed Tuesday while pursuing a group of suspicious men. Police are searching for a second day to locate three suspects in the killing. (AP Photo/Nam Y. Huh)
A mourner holds a sign during a vigil at Lakefront Park to honor the memory of Fox Lake Police Lt. Charles Joseph Gliniewicz on Wednesday, Sept. 2, 2015, in Fox Lake, Ill. Gliniewicz was shot and killed Tuesday while pursuing a group of suspicious men. Authorities broadened the hunt Wednesday for the suspects wanted in the fatal shooting. (AP Photo/Nam Y. Huh)
Police search from a helicopter for suspects in the shooting of a police officer, Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
This undated photo provided by the Fox Lake Police Department shows Lt. Charles Joseph Gliniewicz, who was shot and killed Tuesday, Sept. 1, 2015, in Fox Lake, Ill. Police with helicopters, dogs and armed with rifles were conducting a massive manhunt Tuesday in northern Illinois for the individuals believed to be involved in the death of Gliniewicz. (Fox Lake Police Department photo via AP)
Members of various police agencies gather as they continue searching for suspects in the shooting of a police officer, Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
CORRECTS TO GLINIEWICZ FROM GLINIEWITZ- Police officers confer while searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 outside Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
A heavily armed police officer walks in a shopping area after searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
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)
CORRECTS TO GLINIEWICZ FROM GLINIEWITZ- A police K-9 team rest after searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
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)
Supporters hold signs as police continue searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewitz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
Supporters hold signs as police continue searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
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)
Members of local, state and federal police agencies gather as they continue searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
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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"I believe we are making some progress, some significant progress today," Filenko said.

The gun of the slain officer, Fox Lake Police Lieutenant Charles Joseph Gliniewicz, 52, had been recovered, Filenko said, declining to say where it was found, whether it had been fired or if there were fingerprints found on it.

Evidence taken from the crime scene had been turned over to a crime lab, Filenko said.

Investigators are getting an influx of significant leads and believe there is a good probability the suspects are still in the area of Fox Lake or surrounding communities, Filenko said.

The investigation veered to a nearby area for a few hours on Wednesday night after an Illinois woman said two men resembling suspects tried to get into her vehicle but ran into a cornfield because they feared she was calling police, authorities said.

About 85 federal, state and local police, 11 canine units and three aircraft searched five hours without finding any sign of the suspects before Kristin Kiefer told investigators she had lied to them because she wanted attention, the Lake County Sheriff's Office said in a statement.

Kiefer, 30, of Vernon Hills, Illinois, was charged with two counts of falsifying a police report, the sheriff's office said.

Gliniewicz was killed about 5 miles north of where Kiefer said she saw the suspects.

(Reporting by Suzannah Gonzales; Additional reporting by David Bailey in Minneapolis and Brendan O'Brien in Milwaukee; Editing by Mohammad Zargham and Peter Cooney)

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