It’s a year to the day since Kaitlin Roig barricaded herself and 15 first-graders in a bathroom at Sandy Hook Elementary School, hiding from a gunman who would go on to kill 26 in an 11-minute rampage.

A boy opened fire with a semi-automatic handgun at his Nevada school yesterday, killing a maths teacher who was trying to protect pupils and wounding two 12-year-old classmates, before turning the weapon on himself.

New York state politicians have agreed the first and toughest gun control laws in the nation.