THE gunman who killed three people at a US factory then shot himself dead afterwards was unhappy about his pension deal, police said yesterday.

The gunman who killed three people at a US factory then shot himself dead afterwards was unhappy about his pension deal, police said today.

The man suspected of a workplace shooting that left four people dead and five others injured was believed to be among the victims, police said.

A DISGRUNTLED worker embroiled in a pension dispute with his company walked into the plant and opened fire yesterday, killing three people, wounding five and sending frightened co-workers scrambling into closets and to the snow-covered roof for safety.