Police did not offer a motive for Elijah Brown’s 10-minute rampage, but said there appeared to be nothing random about the killings at the Kansas City, Kan., ConAgra Foods, Inc. plant, according to the Associated Press. They said he passed by some co-workers, telling them, “You haven’t done anything to me, so you can go.”

“This person acted with purpose, he knew exactly what he was doing,” Police Chief Ron Miller said.

Three of those killed were members of an extended family, and a relative said Brown had had an argument with one of them.

Lonnie Ellingburg, 46, was uncle by marriage to Travis Nelson, 23, both of Kansas City, Kan., and nephew to Ardell L. Edwards, 55, of Grandview, Mo., relatives said.

Miller said Brown also shot and killed Leonardo Rodriguez, 49, of Kansas City, Kan.; and a 45-year-old Mexican national whose name was not released pending notification of his family. Four victims died at the plant, and Edwards died hours later at a hospital.

Two other workers were wounded in the workplace violence incident.

Ellingburg’s brother-in law, David Pledger, of Kansas City, Kan., said there had been a “tiff” between Travis Nelson and Brown. He speculated that the other two victims were “probably just in the wrong place at the wrong time.”

Brown, of Kansas City, Kan., had no criminal record, but co-workers described him as strange. He was often teased at work, but not for anything in particular, said Kain Peterson, a plant worker.

Brown had been laid off from the plant, but returned to work a few months ago, ConAgra spokeswoman Julie DeYoung said. The shooting started after an afternoon meeting, but Miller said witnesses told police there had been no arguments.