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© Eric Thayer / Reuters
Police in Fox Lake, Illinois are searching for three men in connection with the shooting death of a police officer in the village, local news reports. The officer's gun and pepper spray were taken.

The manhunt is underway for two white men and a black man who are considered to be armed and dangerous, authorities said.

The Fox Lake officer was pursuing people described as suspicious around 8 a.m. local time Tuesday when he was shot, Lake County Undersheriff Raymond Rose told reporters. Police responding to the scene to help found him in a marshy area. He died at the scene.

An officer who responded to the call could be heard on the scanner saying: " ... send everybody you possibly can ... officer is down ..." the Chicago Sun-Times reported.

Helicopters and police K9 units have been brought in from multiple jurisdictions. Police are going door-to-door in the far northwestern suburb of Chicago.

"If [residents] see anybody in their area ... that doesn't belong or doesn't look right, they should call 911," Rose said.

Grant Community High School and St. Bede School are on lockdown, while School District 15 in McHenry and Gavin South Middle School and Gavin Central Elementary School in Ingleside are on soft lockdown, according to their websites.

Metra has suspended commuter trains on the Milwaukee District North Line, which runs between Fox Lake and Chicago Union Station.