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

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)