The one-page document can also be seen on various Internet humor sites.
After the email went out, Lombardy Elementary School's principal sent a recorded apology to parents, a Brandywine School District spokesperson told WCAU.
"The attachment was something that had been sent to them from a person external to the school," the spokesperson told the news station. "It was not an official document of Lombardy Elementary or the Brandywine School District. This was an embarrassing mistake, but it was just that -- a mistake. It should not have happened, and we apologize for the error."
Parents had mixed reactions to the blank report. According to The News Journal, some said it was "completely offensive and mocks children who are bullied in schools," while another, who didn't give his name, told the paper: "If the children didn't see it, what is the problem? It was a dumb prank, but I don't think it was malicious."