Three employees killed and one injured in shooting at Maryland business, police say

Washington county sheriff said a state trooper also shot in Smithsburg, a town in western Maryland

An employee opened fire at a manufacturing business in rural western Maryland on Thursday, killing three co-workers before the shooter and a state trooper were wounded in a shootout, authorities said.

Sheriff Doug Mullendore of Washington county said that three victims were found dead at Columbia Machine Inc in Smithsburg and a fourth victim was critically injured.