On July 22, 2011, a car bomb exploded in the center of Oslo, outside the office of the Prime Minister, killing eight people. A second attack occurred at the AUF youth camp of the Ruling Labour Party on the island of Utoya by a gunman dressed as a police officer. 69 people were killed, making it the single most deadly attack by a single gunman in history. Right-wing extremist Anders Behring Breivik was arrested and charged with both attacks.