Police in Baraboo, Wis. say they are investigating threats against students and staff at a local high school following the viral photo that showed male students giving a Nazi salute.

The police department said in a statement that authorities are looking into “harassment” against individuals linked to Baraboo High School as well as city employees and local businesses, according to the Milwaukee Journal Sentinel.

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"The scope of the investigation that could have police involvement are not the First Amendment right of free speech, but in the realm of harassment," the department said in its statement.

An online rumor about a potential threat at the school reportedly surfaced last week, prompting parents to keep their students home. The police said the threat was unsubstantiated.

The photo, which was reportedly taken by a professional photographer ahead of the school’s prom, sparked national backlash. At least one student in the photo spoke out against the photo, and said that the photographer instructed students to do the salute.

The school district has condemned the photo, which was taken in the spring but went viral last week.