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

Students of Walter Payton College Preparatory High School protest against gun violence in Chicago, 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/Wang Ping)