WATERLOO, Iowa (AP) — An Iowa high school science teacher has been placed on administrative leave after he made what appeared to be a threatening social media comment about 16-year-old climate activist Greta Thunberg.

The Waterloo Community School District said Friday in an emailed statement that the teacher, Matt Baish, has been placed on administrative leave pending an investigation. Baish’s removal followed a Facebook comment he purportedly posted about Thunberg’s planned appearance Friday in Iowa City for a student-led climate strike demonstration, asking “Who’s all going?” In response, a user named Matt Baish wrote,

“Dont have my sniper rifle.” West High School’s website lists Baish as a science teacher at the school.