Authorities said Monday that the FBI is investigating the discovery of a noose found in the Talladega Superspeedway garage stall of Bubba Wallace, and the governor of Alabama condemned the act against NASCAR’s only Black full-time driver.

Wallace two weeks ago successfully pushed NASCAR to ban the Confederate flag at its venues, though the sanctioning body has not outlined plans on how it will enforce the restriction. Disgruntled fans with Confederate flags drove past the main entrance to the Alabama race track prior to Sunday’s race, while a plane flew above the track pulling a banner of the flag that read “Defund NASCAR.”

Hours after the race was postponed by rain, NASCAR said the noose had been found. The sanctioning body vowed to do everything possible to find who was responsible and “eliminate them from the sport.” It has not offered other details.

Talladega County Sheriff Jimmy Kilgore said NASCAR contacted the FBI, which was handling the investigation. The FBI field office in Birmingham did not immediately return a message left by The Associated Press.

The incident has rocked NASCAR, which returned to racing just last month because of the coronavirus pandemic.

“We are angry and outraged, and cannot state strongly enough how seriously we take this heinous act,” the series said in a statement. “As we have stated unequivocally, there is no place for racism in NASCAR, and this act only strengthens our resolve to make the sport open and welcoming to all.”

The stock car series, founded in the South more than 70 years ago, has tried to distance itself from the flag for years at the risk of alienating a core group of its fan base. It went ahead with the ban as the nation grapples with social unrest largely tied to George Floyd, an unarmed Black man who died in the custody of Minneapolis police.

“God help us,” NASCAR driver Michael McDowell tweeted after word of the noose went public. “The level of evil it takes to do something like this is disgusting. This is enraging and heartbreaking all at the same time.”

Alabama Gov. Kay Ivey said she was “shocked and appalled” by the “vile act” against Wallace, an Alabama native.

“There is no place for this disgusting display of hatred in our state,” Ivey said. “Bubba Wallace is one of us; he is a native of Mobile and on behalf of all Alabamians, I apologize to Bubba Wallace as well as to his family and friends for the hurt this has caused and regret the mark this leaves on our state.”

Reaction from Wallace’s fellow drivers was immediate as they prepared for the rescheduled race Monday afternoon. Retired champion Jeff Gordon called it a “cowardly” act and Ryan Blaney, one of Wallace’s closest friends, tweeted: “You’re my brother and always will be. Don’t let the people who are lower than life to try and bring you down.”

The 26-year-old Wallace has not commented since a statement on social media late Sunday in which he said the “the despicable act of racism and hatred leaves me incredibly saddened and serves as a painful reminder of how much further we have to go as a society and how persistent we must be in the fight against racism.”

“As my mother told me today, ‘They are just trying to scare you,’” he wrote. “This will not break me, I will not give in nor will I back down. I will continue to proudly stand for what I believe in.”