(KCEN) -- In Minneapolis, police are saying they don't have a motive yet on why a man opened fire on his co-workers on September 27, killing four of them.
Witnesses say the 36-year-old shooter may have lost his job at the Accent Sign Company in Minneapolis on Thursday morning.
By the afternoon he opened fire on fellow employees inside the building, killing his employer and several of his colleagues.
The shooter killed himself in the basement of the building.
Four others were taken to the hospital where three of them are still in critical condition.