ANN ARBOR, Mich. (AP) — The University of Michigan says someone sent racist and anti-Semitic emails to students under the name of a professor who has raised concerns about the integrity of the voting system in some states.

J. Alex Halderman denies sending the messages and the school doesn’t believe Halderman’s email was hacked. Instead, spokesman Rick Fitzgerald said Wednesday that Halderman and the students are victims of “spoofing” or forged emails.

Fitzgerald says campus police are investigating. Halderman calls the emails “contemptible.”

They were sent mostly to engineering students and had subject lines such as “African American Student Diversity” and “Jewish Student Diversity.” Two messages included the phrase “Heil Trump.”

Halderman, a computer science professor, urged a recount of presidential election results in Michigan, Wisconsin and Pennsylvania to ensure that a cyberattack hadn’t manipulated totals.

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