Tigard school officials alerted parents this week after a middle school provided 37 pretzels “mistakenly contaminated” with oven cleaner to students on Monday.

The incident happened at sixth-grade lunch at Fowler Middle School, Tualatin-Tigard School District spokesperson Alex Pulaski told The Oregonian/OregonLive.

In an email sent to parents of children at the school, Fowler Middle School Principal Cindy Pellicci identified the cleaning chemical as Alto Shaam, a granular cleaning agent that can cause a burning sensation if it’s swallowed — and induce vomiting in larger doses.

“We are taking this situation seriously,” Pellicci said in the email. “It is an unfortunate event; we will continue to ensure student safety.”

Pellicci said that staff identified and contacted each student who at

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