PORTLAND, Ore. (KOIN) -- Tigard parents want answers and accountability after 37 pretzels were mistakenly contaminated with oven cleaner during 6th-grade lunch on Monday.

Officials at Fowler Middle School confirmed the pretzels-oven cleaner incident but have not explained how it happened. That's what's causing confusion.

KOIN 6 News spoke to Kianna Bell, the mother of a 6th-grader, who received this email:

Fowler Families, We are notifying you of a food contamination situation that happened during 6th-grade lunch today. Pretzels served were mistakenly seasoned with oven cleaner, Alto Shaam, and consumed by students.

She then received a voicemail:

"This is Sharon Mitchell with Hazel or — Fowler Middle School, and you should have received communication sent out today regarding the food

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