nand schoenemann reports. >> someone said there were gunshots, there was a shooting -- shooter. >> reporter: at the end of the workday, authorities were called to a shooting, followed by a report of another attack at another location. then a report of an active shooter inside excel industries. orr it didn't matter who it was, he had no specific target. in his way.>> he first shot someone in the plants parking lot. >> he was looking at him and he yelled and he went how pal pal and entered the building. >> reporter: -- >> inside the building, he shot a total of 15 people. four were killed, including himself, the shooter.>> reporter: the sheriff says the gunman was killed by law enforcement after he went on a shooting spree at four locations. authorities have not yet revealed motive but say the suspect was employed at the plant. and schoenemann, nbc news. >>> today's kansas shooting comes less than a week after six people were shot and killed by one gunman in kalamazoo. authorities investigating that case have called the shootings random.>>> for the 10th time, republican presidential candidate