A Florida-based group called Americans Against Hate plans to protest a Muslim Family Day at Six Flags Over Texas later this month because it says the Islamic organization sponsoring the event supports terrorism.

Local Muslims called the accusation a lie.

"They have an agenda and they have a focus, and that is to absolutely tear down any Muslim organization that has any level of promise in America," said Khalil Meek of Plano, president of the Muslim Legal Fund of America. "I'm not surprised they're doing it, and I don't even want to talk about them because the more hype they get, the more voice they get. I'd rather just ignore them and pray they grow up and learn how to become responsible people."

The demonstration may be easy to ignore – and miss. Fewer than 50 people have turned out for other protests, according to the group's chairman, Joe Kaufman.

He said education, not turnout, is what's important.

"We believe this organization is a threat to the city and a threat to the United States because of its ties to overseas terrorism, because of their financing of overseas terrorism," he said.

Mr. Kaufman says the Islamic Circle of North America was founded three decades ago as an American arm of the terrorist group Muslim Brotherhood of Pakistan and funnels money to Hamas.

Mohammad Barney, president of the Dallas chapter of ICNA, said the accusations are troubling and untrue. According to its Web site, ICNA supports Islamic culture and education while promoting justice and understanding.

"It's disturbing that they are writing false statements like that," said Mr. Barney. "People have the right to say whatever they want, but that doesn't make it true."

The Anti-Defamation League – a pro-Jewish group – seems to agree. ICNA is not listed as a threat on its Web site.

"We don't involve ourselves in that kind of activity," said Mark Briskman, regional director of the league, who said his group would not participate in the protest. "He made a lot of claims ... without clear documentation of those claims. His statements are problematic."

A spokesman for the Dallas FBI office would not comment, but the former director of the local office said agents weigh accusations carefully.

"Anybody in today's world can make any kind of allegation; they can throw anything out there and hope it sticks," said Danny Defenbaugh, who led the Dallas office from 1998 to 2002. "But if somebody makes allegations and can't provide any substantive evidence, the FBI is not going to waste its time. Why should they?"

However, Mr. Kaufman, the man organizing the Oct. 14 protest said the goal of the placard-carrying demonstration is to wake up the public and the government. He said his group attempts to target radical Muslims, not all Muslims.

"I'm not somebody who revels in holding protests everywhere," he said, "but I feel this is an effective way of notifying the public to what they have in their backyard as well as put pressure on the government to shut down these groups."

The public, he said, should not be fooled by the innocent-sounding name of Muslim Family Day.

"It would be silly for them to hold an event called 'Muslim Terrorism Day' or 'Support Al-Qaeda Day,' " Mr. Kaufman said. "Of course, they're going to have an event with the most innocuous name possible."

Mr. Kaufman said he wrote letters to Six Flags' board of directors, including Mark Shapiro, president and CEO.

"While we understand that the vast majority of American Muslims have nothing to do with terrorism, the opposite is the case with ICNA," Mr. Kaufman wrote. "The organization is a threat to the Dallas-area and a threat to our nation and should not be allowed anywhere near your amusement park – at any time. We therefore demand that you cancel Muslim Family Day."

Sharon Parker, public relations manager for the park, said that Muslim Family Day will go on and that the park will also be open to the public that day.

"We don't discriminate based on race, religion, sexual orientation, political persuasion or any other factor," Ms. Parker said. "Our ultimate goal is to provide a day of fun for all of our guests."

She said no extra security is planned, but police said they will monitor the protest.

"We don't plan any problems from the group coming to demonstrate," said Arlington police Lt. Blake Miller, a department spokesman. "Our staff is aware of it, and we'll have a presence out there."

He would not say how many protesters police expect or how many officers the department plans to deploy.