In 2014, a 15-year-old shot and killed a schoolmate in central Mexico state, and in 2017, another 15-year-old shot and wounded four classmates at a high school in the northern city of Monterrey.
Deadly Nightclub Shooting in Monterrey Mexico At least 20 people are killed when suspected drug gang members open fire at a bar in Monterrey, Mexico's richest city. Video courtesy of Reuters.