MyPillow CEO Mike Lindell, an ally of former President Trump, revealed on Thursday, Aug. 12, that he was physically attacked at a hotel on Wednesday night in South Dakota. He was holding a symposium on alleged fraud and interference in the 2020 election.

“Last night when I got to the hotel, I was attacked,” Lindell told the attendees at his “Cyber Symposium” at the South Dakota Military Heritage Alliance in Sioux Falls.

“I’m OK. It hurts a little bit … I just want everyone to know all the evil that’s out there,” Lindell said.

Lindell later claimed it was “Antifa,” but gave no details about the incident.

The Argus Leader cited the Sioux Falls police department saying that they had not yet received a report on Thursday morning. Still, an officer would visit Lindell to ask about the incident. A police spokesman said an investigation is ongoing and no arrests have been made.

A man on stage with Lindell at the event said the organizers had received “credible threat warnings” ahead of the three-day event, Western Journal reported.

Lindell organized the conference to present evidence of widespread voter fraud and other election malfeasance cost Trump the November election. He announced in July that he hoped 300-400 “cyber-forensics experts” would attend his cyber symposium and back up his allegations.

During the event, Lindell argued that China hacked into U.S. election systems and switched votes in favor of President Joe Biden, The Washington Times reported.

The MyPillow founder said he had 37 terabytes of “irrefutable” evidence to prove his claim, but cyber experts now say the data is illegitimate.

Another target is Dominion Voting Systems that Lindell claimed had helped rig the 2020 election. Dominion is suing Lindell for defamation, while he is countersuing Dominion for violating his First Amendment rights.