northern illinois for the three men suspected of shooting dead a veteran police officer. officials are only saying they are searching for two white men and one black man. with helicopters overhead, police officers with sniffer dogs scoured a wide with area around fox lake. a normally quiet community about an hour from chicago. >> the sheriffs office says the officer lieutenant was chasing three suspects on foot before found with a gunshot wound. he was also stripped of his gun, as well. he's the fourth officer to be killed on duty in the united states in the last nine days. now authorities asked residents to remain in their homes, inside of their businesses during the sweeping and pain staking manhunt. >> we're asking residents in the fox lake area to be on the alert if they see anything us pishs to dial 911 immediately. anything out of the ordinary, anything they are not used to seeing in their subdivisions.