NASCAR driver Mike Wallace and his daughter say they were brutally beaten at a Rascal Flatts concert in Charlotte, North Carolina, over the weekend.

“I normally would not post personal affairs but this is to help and give advice to our friends, do not ever talk to a group of now what appeared to be drunk or drugged up young adult men or women when your trying to get in your car and leave the un guarded PNC amphitheater in Charlotte, NC parking lot after a good Rascal Flatts concert,” Wallace wrote on Facebook.

Attached was a photo taken by an ambulance driver showing what he “looked like after I was knocked out and crap beat out of me.” He said he suffered a concussion as three men allegedly continued to attack him while unconscious Friday night.

WSOC reports he lost three teeth and received 12 stitches, but was mainly concerned for his daughter. Lindsey Wallace Van Wingerdenw was also hospitalized with injuries after trying to protect her father.

“It scares us to think we can’t even go to a concert together without someone going to attack you or what’s going to happen next,” she told the Charlotte TV station.

Wallace’s brother, former NASCAR racing star Kenny Wallace, shared photos of both of their injuries publicly on Twitter. He said his niece tried to shield Mike’s body and the attackers kicked her in the ribs.

“The number ONE question I get from the @NASCAR world is ‘What did Mike do?’. Sad part is Mike did nothing. It was a GOON attack,” Kenny Wallace tweeted Sunday. “…3 men continued to kick Mike in the face while Mike was ‘Knocked Out.'”

USA Today reports three men were arrested and charged with simple assault: Paul Lucas, 29, Nathan Lucas, 22, and Randolph Mangum, 24. They were released after posting $1,000 bond each, according to the Mecklenburg County Sheriff’s Office.

“Whats worse is three of guys that beat my family up were arrested and out of jail before we were out of the hospital,” Mike Wallace wrote on Facebook.

The three suspects are scheduled to appear in court on July 22. Authorities continue to investigate for a possible motive.

Kenny Wallace told his 276,000 Twitter followers that he believes the men work for a local landscaping company and encouraged people not to support their business.

Rascal Flatts has not yet commented on the incident. The country band is scheduled to perform at the Lakeview Amphitheater in Syracuse on Friday.

Mike Wallace has not competed this racing season, but has started in nearly 500 Xfinity Series races, earning four wins. According to the Charlotte Observer, he has also won five races in 115 starts in the Camping World Truck Series.