JOHANNESBURG (Reuters) -- A South African soccer referee pulled a gun and shot dead a coach who questioned one of his rulings, police said on Sunday. Inspector Mali Govender of the Grahamstown police in the Eastern Cape province said a fight broke out after the referee gave a yellow warning card to a player in a local match on Saturday. "There was an altercation...and the referee became threatened when the other team approached him because they were angry," Govender said. "So he pulled out a gun and killed the coach of the visiting team." Govender said the coach died on the field while the referee fled the scene. Police were confident of making an arrest soon, she added. South Africa has one of the world's highest murder rates with an alarming 47.4 murders per 100,000 people, or eight times the figure for the United States.