Several homes located near the residence of Sen. Pat Toomey in Zionsville, Pa. were vandalized with anti-GOP graffiti over the weekend in what Toomey called an "appalling" incident.

As CBS3 reports, Pennsylvania State Police are investigating after vandals defaced homes near Toomey's house with red spray paint late Saturday or early Sunday. The Morning Call reports that the vandalized houses are located across the street from Toomey's home in Zionsville, Lehigh County.

The graffiti consisted of messages insulting the Republican party and Toomey, and included phrases such as "Nazi, Slavers, Rapists, Cross Worshippers = GOP," "Look Out Toomey And You Neo Nazi Republicans," and "#Americans Against The Republican Party."

"That was just appalling. There's just absolutely no place for that," Toomey said at a campaign stop Tuesday morning in Northeast Philadelphia. "You know, these were my neighbors and good friends and wonderful people and it's just a shame that some politically motivated people would do something like that, it's really, really despicable."

Toomey on Monday debated in Philadelphia with Democratic opponent Katie McGinty, who is currently running against Toomey for his Pennsylvania Senate seat. McGinty has called the vandalism "unacceptable."

"This act of vandalism is unacceptable," McGinty said in a statement. "I hope law enforcement can quickly investigate the matter and hold the people responsible for it accountable."