The statue was tied with a telephone cable, which indicates that the vandalism was intentional.
A crucifix was also broken as a result of this act of vandalism.
According to the video surveillance system, the act of vandalism would have been committed by teenagers.
An unknown perpetrator is currently being searched for by polish police.
The statue, targeted by jihadists, has made a long and perilous journey from Iraq to Italy.
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It was decapitated in the Christian village of Karamles, between Mosul and Erbil, during the Islamic State’s occupation.
"We will also try to repair the damaged statue as soon as possible," said a local priest.
According to the school leaders, it is necessary to respect the laicity law of 1905.