400 Inmates Fight in Arizona: Top 5 Prison Brawls in History

400 inmates were involved in a fight at the Arizona State Prison Complex in Tuscon on Sunday night. The cause of the melee is under investigation. In the many prison riots across the country in the past century, the causes have varied from overcrowding to racial tension.

A file photo of Alcatraz, the island prison, on April 7, 2011 in San Francisco, United States. Alcatraz was the scene of a prison riot in 1946 that left five dead, one of approximately 1,300 prison riots in the country in the 20th century. Justin Sullivan/Getty Images

400 inmates were involved in a fight at the Arizona State Prison Complex in Tuscon on Sunday night. The cause of the melee is under investigation. In the many prison riots across the country in the past century, the causes have varied from overcrowding to racial tension.