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Students across the United States (US) walked out of their classes on Friday as a part of a National School Walkout over a demand to end gun violence and introduce anti-gun reforms. The event, which grew out of a petition on the Change.org web site, saw more than 2,000 walkouts nation-wide, with at least one planned in every U.S. state and the District of Columbia, reports the New York Times. Student Lane Murdock launched the National School Walkout campaign in the wake of the Parkland shooting in Florida.