A US Army reservist who was asked to leave a gun range after identifying himself as a Muslim sued the owners on Wednesday, the latest in a series of cases across the US alleging anti-Islamic discrimination.

The lawsuit on behalf of 29-year-old Raja’ee Fatihah, who works for the Oklahoma Department of Human Services, was filed in US district court against the owners of Save Yourself Survival and Tactical Gun Range in Oktaha, Oklahoma.

A sign posted on the business declared the range a “Muslim-free” establishment, and is similar to signs that have been placed at businesses in several states, said Brady Henderson, the legal director the Oklahoma chapter of the American Civil Liberties Union, which filed the suit.

“Whether the sign in question says ‘no Muslims’ or whether it says ‘no coloreds’ or whether it says ‘no women’ or ‘no Christians’ or ‘no Buddhists’ ... it is just as un-American and, fundamentally, it is just as wrong,” Henderson said.

Fatihah, a board member of the Oklahoma chapter of advocacy group the Council on American-Islamic Relations (CAIR), said he went to the gun range after learning about the sign. He said the owners of the store were pleasant and welcoming until he told them he was Muslim. “At that point, they started treating me with suspicion,” Fatihah said.

A similar lawsuit was filed by the CAIR in 2015 against a gun shop in Florida, but that case was dismissed by a federal judge who determined CAIR could not prove its members were harmed by the store’s Muslim-free policy, Henderson said.

Robert Muise, with the American Freedom Law Center, represented the Florida gun shop owner and now is working for Chad Neal, the owner of the Oklahoma gun range.

Muise said Fatihah was denied service because he was belligerent, not because of his religion, and that the sign declaring the shop a “Muslim-free” business was protected free speech.

“The only thing the law prohibits is if somebody denies services strictly on the basis of religion, and that didn’t happen here,” Muise said.

Fatihah denies he acted belligerently.

Claims of discrimination by business owners against Muslims have been reported in numerous states, and formal complaints have been filed with the US Department of Justice regarding incidents in Arkansas, Florida and New Hampshire, said CAIR’s national director, Ibrahim Hooper.

“It’s one of those issues that’s tied to the overall rise of anti-Muslim bigotry in our society,” Hooper said.

US Department of Justice spokeswoman Dena Iverson declined to comment Wednesday on the status of the complaints.