Graffiti reading "NAZIS DIE" was spray-painted onto the outside of Keswick Theatre in Glenside ahead of Thursday's appearance by conservative commentator Tomi Lahren.

Abington police are investigating the vandalism, which occurred some time overnight Thursday.

"I know it's been cleaned up by the Keswick Theatre," Chief Patrick Malloy said. "It's obviously in response to the show tonight. Of course, that type of graffiti just promotes violence. We wanted them to have that cleaned up as quickly as possible."

Police are reviewing surveillance cameras to determine who is responsible, Malloy said.

A Fox News contributor, Lahren retweeted an image of the graffiti, adding the comment, "Truth is the new hate speech. You don't intimidate me! See you tonight, Glenside."

Keswick Theatre General Manager Judith Herbst did not immediately return a call seeking comment.

Lahren's appearance is expected to draw protests from an anti-fascist group. Police will be deployed to the theatre to monitor the demonstrations outside the show, which begins at 7:30 p.m.

The event, dubbed "Tomi Lahren: Family, Freedom and Final Thoughts" is billed as "an exclusive evening of dialogue and discussion, covering all of today's hot-button issues."

The local chapter of Refuse Fascism, an activist group opposed to President Donald Trump, plans to demonstrate outside of the event.

A Trump supporter, Lahren, 25, is known for her critiques of liberal politics. She has called Black Lives Matter "the new KKK," labeled Middle Eastern refugees as "rape-u-gees," and accused the mainstream media of being "liberals who masquerade as journalists."

Her critics have branded her as a racist, calling her "White Power Barbie." She has denied the accusations.

Lahren hosted shows for One America News Network and TheBlaze before joining Fox News as a contributor in 2017.