A Wisconsin hospital worker has been fired for intentionally removing COVID-19 vaccine from a refrigerator – forcing the hospital to throw out more than 500 doses. Aurora Medical Center – Grafton, outside Milwaukee, said Wednesday that 57 vials of Moderna vaccine were taken out of a pharmacy refrigerator and left overnight.

The hospital launched an investigation and was led to believe inadvertent human error was to blame, reported CBS 2 Chicago. But on Wednesday, the worker who was responsible admitted to doing it on purpose, Advocate Aurora Health said.

The hospital said it had "notified appropriate authorities for further investigation."

Read more: CBS News