Students participate in "National School Walkout" to protest gun violence in U.S.

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Students from Francis Polytechnic High School protest against gun violence in Los Angeles, the United States, on March 14, 2018. Students participated in a nationwide demonstration against gun violence "National School Walkout" in the United States on Wednesday, one month after a high school shooting in Florida in which 17 people were killed. (Xinhua/Zhao Hanrong)