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Utah State University is redrafting some free speech and safety standards after four students were told to erase their anti-abortion chalk messages, a university spokesman said Wednesday.

The Logan school apologized to students Tuesday after campus police told their group to remove the 897 chalk hearts they had drawn near the library.

The chalk display also called for defunding Planned Parenthood and putting an end to abortion. It included quotes from religious and political leaders.

USU spokesman Tim Vitale said university police should not be limiting political expression, but also have a job to limit graffiti on campus.

"We have to look at our policies to make sure first and foremost that student speech is protected," Vitale said.

Administrators are now clarifying police protocol related to signage, Vitale said, in an attempt to bring it in line with free speech standards.

Someone who identified herself as "Melissa" posted on an anti-abortion website last week, saying an officer told her the messages were considered vandalism because students didn't get prior approval to draw them.