LAWRENCEVILLE, Ga. -- Hazmat crews in Gwinnett County were called to clean up waste left behind by a Democratic National Committee bus.

According to a Lawrenceville Police Department report, officers were called to the O'Reilly Auto Parts at 525 Grayson Highway after receiving reports that an RV was illegally dumping its sewage into the storm drain.

An employee of the auto parts store told the responding officer that he watched the RV stop in the turn lane of Grayson Highway in front of the store and spill raw sewage onto the roadway and into the storm drain.

Pictures taken by the store employee showed that the RV featured pictures of Democratic Presidential nominee Hillary Clinton and her running mate Tim Kaine.

The officer stated that a large amount of drying toilet paper was on the roadway where the RV had been and a "foul smell" was left in the air.

Gwinnett County Fire Hazmat units cleaned up the spill.

PHOTOS: DNC bus dumps raw sewage on street

According to a news release, the bus is part of the Democratic National Committee's "Forward Together" tour, and is "campaigning in Georgia to provide additional support for Hillary Clinton and to promote Democrats up and down the ballot."

A DNC spokesperson issued a statement Tuesday evening saying:

“This was an unacceptable mistake and we apologize to the Lawrenceville community for any harm that was caused. We are taking corrective action with the charter bus company to prevent this from ever happening again and contacting local officials to determine the best course of action.”

RELATED | DNC apologizes after campaign bus dumps sewage on Georgia street

The bus was in Lawrenceville for a Latino Community Early Vote Event. it then traveled to Emory University for an event with student leaders there before heading to the Bibb County Phone Bank in Macon on Tuesday night.

The bus is scheduled to be back in Atlanta on Wednesday for a presidential debate watch party with former Atlanta Mayor Shirley Franklin.

UPDATE: State takes over DNC bus sewage dump investigation

More election coverage:

RELATED | What to know about voting early in Georgia

PHOTOS: The many faces of Hillary Clinton during #DebateNight