Political tensions once again hit a new high in Loudoun County just hours before election day: Campaign yard signs supporting President Obama were vandalized in Sterling on Monday, according to the Loudoun County Sheriff's Office.

The three signs, located outside two residences on Broad Run Drive in Sterling, were spray-painted with racial epithets, profanity and a swastika, authorities said. There was also similar spray-painting on the nearby street, according to Liz Mills, spokesperson for the Sheriff's Office.

Authorities responded to the report around 9:30 a.m. Monday, according to authorities. The residents of the two properties were not home at the time, according to the Sheriff's Office.

There have been numerous reports of stolen and vandalized campaign signs in Loudoun this year -- including one recent incident when a large yard sign supporting Republican candidate Mitt Romney was set on fire in a Leesburg yard.

Mills said the investigation into the Sterling vandalism remains open.