A science experiment gone wrong at a Tennessee elementary school sent 18 students and a teacher to the hospital on Friday, officials said.

The third-graders at Vena Stuart Elementary in Gallatin were conducting science experiments with an outside presenter and several said they began feeling sick after an experiment with dry ice, news outlets reported, citing a statement from Sumner County Schools.

Several children became nauseous and school administrators called emergency responders, who transported the students and teacher as a precaution, Sumner County Schools’ Director Scott Langford said in a video posted to social media.