Colorado teachers flooded into the state Capitol Friday to press for better protections for students and school staff after a 17-year-old Denver student shot two administrators, fled to the mountains and killed himself. Roughly 1,500 teachers and their supporters called for improved school security, more mental health support and tighter gun control measures, adding to pressure on lawmakers a day after students and parents converged at the Capitol to make similar demands. School shootings are becoming increasingly frequent in the U.S., and teachers at the rally voiced the fears they feel during safety lockdowns that are now regular occurrences. They also raised questions about the circumstances surrounding Wednesday’s shooting at East High School, which came as the boy was being patted down for weapons, a daily requirement because of his behavioral issues including a pending firearm charge, according to school officials. Some East High School teachers at Friday’s rally said they did not know any students at the school were being regularly patted down until the shooting. “I want to go into a building every day where I don’t need to ask if my kids are getting a pat down because I know nobody is bringing guns into the school,” said English teacher Josh Garfinkel. Schools were canceled Friday in Denver in response to the shooting.