THREE teachers were shot dead in the staffroom of a Soweto school at about 8.30am on Thursday, allegedly by a colleague, police said. A man has been arrested and is being held at the Meadowlands police station. Soweto police spokesman Captain Richard Luvhengo says the gunman was standing with two female colleagues inside the staffroom when a third teacher — a man — walked in. According to eyewitnesses, the gunman turned to leave, then seemed to change his mind. He turned around and allegedly shot the man before turning the gun on the two women.