UPDATE: Rahal Letterman Lanigan's Zionsville HQ site of FBI activity

Zionsville police say the Federal Bureau of Investigation was at Rahal Letterman Lanigan Racing on Tuesday.

Investigators were seen going in and out of the building, and there was a large presence of FBI vehicles in the parking lot.

The nature of the FBI's activity is unknown. A spokesperson for the FBI said they could not comment on the matter.

According to WRTV, a source told the news outlet that the FBI was executing a search warrant at the facility.

Rahal Letterman Lanigan Racing is a professional auto racing team that competes in the NTT IndyCar Series. The team is owned by Bobby Rahal, David Letterman, and Mike Lanigan.

The team's headquarters are located in Zionsville, Indiana. The team has won 10 IndyCar races and two championships.