Around 150 million school children aged 13-15 are the victims of violence from their peers, says a new report from the UN Children's Fund.
The study published on Thursday, measures the number of students who report having been bullied over the period of a month, or involved in a physical fight during the previous year, and shows that for many young people, the school environment is not a safe place, but a danger zone where they have to learn in fear.
United Nations Children's Fund (UNICEF) Executive Director Henrietta Fore says that these incidents have a negative impact on students' education and well-being, whether they live in rich or poor countries.
"Every day, students face multiple dangers, including fighting, pressure to join gangs, bullying both in person and online violent discipline, sexual harassment and armed violence," she said, adding that: "In the long-term it can lead to depression, anxiety and even suicide. Violence is an unforgettable lesson that no child needs to learn."