10 students at a Los Angeles middle school were treated for possible cannabis overdose on Thursday, in what officials called a medical emergency.

The students treated were between 12 and 15, and experienced mild to moderate symptoms according to the LAFD.

LAFD representative Erik Scott put the community’s mind at ease by explaining, “This is not any sort of fentanyl-affiliated overdose. We want to make sure everybody knows that,” but exactly what the students ingested remains a mystery.

It is believed to have been an edible cannabis product.

The Los Angeles Unified School District said in a statement, “We take the health and safety of our students very seriously. Every effort is made to ensure our students learn in a safe environment. Los Angeles Unified maintains an ongoing partnership with local health agencies, community partners and medical experts to provide training to school staff and education for our school communities.”