One US kindergarten has posted a nursery rhyme teaching kids to hide during a school shooting.
Twitter user Georgy Cohen posted a photo of the nursery rhyme, which was posted in a classroom in Somerville, Massachusetts.
It tells kids what to do in the event of a shooting and goes to the tune of Twinkle Twinkle Little Star.
"This should not be hanging in my soon-to-be-kindergartener’s classroom," Cohen wrote.
"I’m only going to add one more comment to this: the school is doing exactly what they need to be doing, and I am glad for it.
"My issue is with the political & cultural factors that brought us to this sad state. Please talk to your legislators about the need for gun reform."
Somerville mayor Joseph Curtatone and superintendent Mary Skipper said in a joint statement to The Boston Globe that "unfortunately, this is the world we live in".
"Just like school fire drills, lockdown drills have sadly become a common practice in schools, and educators do everything they can to reduce students’ anxiety and stress."