A man running for U.S. Senate in Iowa was jailed in Lincoln on Friday after he allegedly threatened a student on the University of Nebraska-Lincoln campus, police said.

Philip Storey, 41, is an independent write-in candidate running against Republican incumbent Sen. Charles Grassley and Democrat Roxanne Conlin.

UNL Police said he was campaigning on City Campus at about 8 a.m. Thursday when he saw a student worker, 29, removing his campaign signs from university property.

He told the student "if she continued removing the signs, that he would kill her," Assistant UNL Police Chief Carl Oestmann said, "and then again reiterated about harming her further and having someone come harm her if she continues to remove the signs."

The student reported the alleged incident to police, who contacted Storey in Lincoln the next day.

Storey turned himself in at the UNL police station just after 1 p.m. Friday, and was lodged in Lancaster County jail on suspicion of making terroristic threats, a felony.

He remained there late Friday evening.

It's not clear why Storey was campaigning in Nebraska, Oestmann said.