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Here is a timeline of some of the worst shooting incidents carried out by one or two gunmen around the world in the last 25 years:
June 2001 - NEPAL - Eight members of the Nepalese Royal family were killed in a palace massacre by Crown Prince Dipendra who later turned a gun on himself and died a few days later. His youngest brother also died later, raising the death toll to 10.
April 26, 2002 - GERMANY - In Erfurt, eastern Germany, 19-year-old Robert Steinhauser opened fire after saying he was not going to take a math test. He killed 12 teachers, a secretary, two pupils and a policeman at the Gutenberg Gymnasium, before killing himself.
March 11, 2009 - GERMANY - A 17-year-old gunman dressed in combat gear killed nine students and three teachers at a school near Stuttgart. He also killed one other person at a nearby clinic. He was later killed in a shoot-out with police. Two additional passers-by were killed and two policemen seriously injured, bringing the death toll to 16 including the gunman.
July 22, 2011 - NORWAY - Police seize a gunman who killed 69 people at a youth summer camp of Norway's ruling political party, on the small, holiday island of Utoeya. Anders Behring Breivik is later charged with the killings, as well as with an earlier bombing in Oslo which killed eight people. The trial ended last month with Breivik saying that his bombing and shooting rampage was necessary to defend the country - prompting a walk-out by relatives of his victims.
December 13, 2011 - BELGIUM - Gunman Nordine Armani killed three people, including a 17-month-old toddler, wounding 121 in a central square in the eastern city of Liege, before shooting himself. The next day Belgian investigators found the body of a woman in warehouse used by the gunman raising the death toll, including the killer, to five.
July 20, 2012 - UNITED STATES - A masked gunman, 24-year-old James Holmes, killed 14 people and wounded 50 others (12 people killed and 40 others wounded, according to an Agence France-Presse report) when he opened fire on moviegoers at a showing of new Batman film "The Dark Knight Rises" in the city of Denver. (With an Agence France-Presse report)