NEW YORK, June 8 (Xinhua) -- Violence in U.S. schools has been on the rise since students returned to the classroom from the COVID-19 pandemic, while school leaders and experts around the country have reported an unprecedented number of guns in schools and climbing threats, reported The Washington Post on Wednesday.
The most recent case in point was a young father and his teenage son, who were killed on Tuesday when a gunman opened fire at a high school graduation ceremony in Virginia.
