ST. HELENS, Ore. -- Two people were arrested Monday in connection with the HazMat emergency that left 31 customers sickened and shut down a Safeway store in St. Helens last week.

Investigators believe the suspects intentionally sprayed Mace inside the grocery store.

About 100 people were evacuated from the store after several people started coughing and complaining that their throats hurt. Investigators said 31 victims had to get medical treatment at the scene and one patient was transported to a local hospital.

Elisha Kimberly Nichols, 19, of Rainier, Ore. was arrested Monday and faces several charges including 31 counts of assault, and recklessly endangering another person. She also faces disorderly conduct charges and unlawful use of Mace. Her bail was set at $396,500.

The second suspect was a minor and referred to the Columbia County Juvenile Department.

The store eventually reopened Thursday morning after investigators collected clues and studied surveillance video.

Background: HazMat scare at St. Helens Safeway

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