It happened at North Arlington Middle School in Bergen County.
According to North Arlington police, the deer ended up in a locked office as students were being dismissed.
It's not clear yet what caused the doe to go inside -- whether it was food, a reflection or something else.
This is another photo of the deer obtained by Eyewitness News, which appears to show the deer entering the school:
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The deer knocked over a water cooler and busted into a wall trying to get out.
An animal control worker was called to the school, tranquilized the deer and removed it from the building.
The deer was apparently wrapped up in a blanket and taken out on a cart, as seen in this photo:
No students were involved and no one was injured.