Authorities are looking for three suspects after a Fox Lake, Ill., police officer was fatally shot Tuesday. The officer was identified as a 30-year police veteran named Joe Gliniewicz. Police say they are looking for two white men and one black man, all of whom are armed. The officer's gun and pepper spray were taken. The FBI and U.S. Marshals are also assisting in the search, which has put four schools on lockdown and left people locked in their homes in Lake County, Illinois. A little before 8 a.m., Gliniewicz radioed in saying he had to check some suspicious activity and later was involved in a foot pursuit before communication was lost. He has married with four sons.