CINCINNATI (AP) — An Ohio high school has canceled its prom to punish students for a prank: a massive water balloon fight at lunch.

The Cincinnati Enquirer (http://cin.ci/Xszo65 ) reports the principal of Withrow High School in Cincinnati says students used social media last month to plan the prank.

Principal Sharon Johnson says staff found out and tried to prevent it. She made announcements the day of the planned prank, warning students the prom would be canceled if they had the balloon fight. School officials were concerned over safety.

But about 150 to 175 students went ahead with it. Johnson says there was water everywhere and some students were upset and slipping and falling.

Johnson says she had received only a few phone calls from upset parents.

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Information from: The Cincinnati Enquirer, http://www.enquirer.com