A Massachusetts mother has been left shocked after noticing the lyrics to a song posted on the wall of a kindergarten.
To the melody of Twinkle, Twinkle Little Star, the lyrics are rewritten telling students what to do if there is an active shooter in the school.
It begins "lockdown, lockdown, lock the door. Shut the lights off, say no more".
It continues, "go behind the desk and hide, wait until it's safe inside. Lockdown, lockdown, it's all done. Now it's time to have some fun".
Parent Georgy Cohen posted the picture to Twitter, writing, "this should not be hanging in my soon-to-be-kindergartener's [sic] classroom."
Her post has since been shared more than 46,000 times on Twitter and has drawn comments and criticisms from around the world.
"The country is a horror movie," one Twitter user said, while another said "Kindergarteners [sic] should be learning the alphabet and playing, not practicing lockdown drills."
There have been over 20 school shootings in 2018 so far in the United States.
Most recently, 10 people were killed at Santa Fe High School in Santa Fe, Texas when a fellow student opened fire.
While school shootings have become commonplace in the country, many said the kindergarten lullaby was a step too far.
Ms Cohen told US newspaper The Boston Globe, the poster was "jarring" and said students didn’t have to deal with those types of threats when she was in kindergarten.
While Ms Cohen did not directly identify the school, it is believed to be a part of the Somerville district in North Boston.
In a statement, Superintendent Mary Skipper and city Mayor Joseph Curtatone praised the teacher's creativity, but said they regretted how common lockdown drills had become.
"As much as we would prefer that school lockdowns not be a part of the educational experience, unfortunately this is the world we live in," they wrote. "It is jarring — it's jarring for students, for educators and for families."
Following the overwhelming response to the tweet, Ms Cohen requested that people call their congressional representatives to advocate for gun reform or support organisations like gun safety advocacy group Everytown and Sandy Hook Promise.
