MURFRESSBORO, Tenn. -- The Republican headquarters in Murfreesboro was vandalized, and workers there said they have received threats.

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The Republican Party in Rutherford County is planning a rally Tuesday night, where hundreds of people are expected and singer Aaron Tippin is slated to perform. Police believe these vandals may have been trying to draw attention away from the event.

Overnight, the Republican Party’s office on the courthouse square in downtown Murfreesboro was attacked. A large brick with a symbol for anarchy written on it was thrown through a window, taking out the entire glass front.

Nothing was taken, but workers said it may cost $3,000 to replace the glass.

Party leaders said this comes after weeks of threatening phone calls, with one person threatening to "tie them up,” and other vandalism, like the spray-painting of doors and stolen campaign signs.

"I was shocked,” said Lou Ann Zelenik of the Rutherford County Republican Party. "I hate someone would resort to this, that would want to empower themselves, and we have our event tonight. Police say that might have had something to do with it. We don't know."

“People that are so threatened that he's going to win, to do something like this is ridiculous,” said Janice Martin of Murfreesboro.

Police were investigating Tuesday afternoon and said they had a couple of leads. They also said they will have extra security at Tuesday night’s political concert in Murfreesboro.