A manhunt, involving helicopters and sniffer dogs, is underway in the US state of Illinois after a police officer was shot and killed.
It happened at Fox Lake - around 55 miles north of Chicago.
Detectives are looking for three suspects.
MORE: Police conducting ground, air search for suspects in shooting death of Chicago-area cop http://t.co/TIoQTTFna2 pic.twitter.com/9lG3li6qQq
— CBS News (@CBSNews) September 1, 2015
More as we get it.