CHICAGO, March 14, 2018 (Xinhua) — 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/IANS)