Nearly two dozen school children in China reportedly became ill last week following a suspected poisoning, which prompted a kindergarten teacher’s arrest.

23 kids received medical care following the incident, which erupted after they ate breakfast at school, BBC News reported, citing state media.

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The arrested teacher is suspected of having added sodium nitrite to their meal, although a motive for the alleged action wasn’t immediately clear, the Jiaozuo city police said, according to The Associated Press.

Overexposure to sodium nitrite can be toxic and possibly fatal.

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15 children have since been released from the hospital, while others are still receiving treatment, BBC reported, citing the state-run Xinhua news agency.

The Associated Press contributed to this report.