A former OU student was arrested Sunday, two days after the university filed a restraining order against him for making threatening fliers.

Robert Lien Anderson, 38, was picked up between late Saturday night and Sunday afternoon and is being held in the Cleveland County Detention Center. Officials at the center could not release information regarding the actual time of the arrest, stating information could only be released to family members.

A warrant was issued for Anderson’s arrest Friday after he was charged with advocating unlawfulness on school grounds in the Cleveland County District Court.

OU filed a restraining order against Anderson after it was determined he was the creator of two threatening fliers.

“While we believe that it is likely this is his idea of a prank, out of an abundance of caution, we have obtained an order to keep him off the campus, and the university is prepared to deal with the situation should he attempt to come on the campus,” said Blake Rambo, spokesman for OU President David L. Boren.

Rambo added OU has “coordinated [its] efforts with other authorities.”

OU also has taken security precautions for Monday, the date mentioned in the first of Anderson’s two threatening fliers. The first flier states, “On April 21, 2008, all operations at OU Norman will cease.”

“The university is prepared to deal with the situation,” Rambo said.