FOX LAKE, Ill. -- A police officer has died after being shot about 60 miles north of Chicago on Tuesday.
Officials say the officer was a 32-veteran of force.
Canine units, helicopters and officers on foot, FBI and ATF are combing the area, searching for three suspects.
The shooting happened about 10 minutes before 8 a.m. local time, according to the sergeant. The slain officer worked for Fox Lake Police, a community of about 60,000 people within Lake County.
The officer radioed that he was "out with three suspects," according to Cavelli.
The officer described them as two white men and one black man, he told CNN. Radio communication dropped off and backup officers were sent. They found the officer with a gunshot wound.
Residents have been asked to remain inside their homes and businesses, he said. Some schools have been placed on lockdown, he said.
"We asked residents to report any suspicious activity they happen to see, whether they think it's something minor or major and to keep an eye out for these three individuals," Covelli said.