Making another controversial statement, Republican presidential front-runner Donald Trump said Americans are being hoodwinked into believing that the terrorists who destroyed the World Trade Center buildings in New York on Sept. 11, 2001, killing nearly 3,000 Americans, were Iraqis contracted by al-Qaeda leader Osama bin Laden.

Speaking at a campaign event in Bluffton, South Carolina on Wednesday, Trump might have revealed the content of a top-secret document when he identified the nationality of the alleged perpetrators of the worst terrorist attack on the United States, Charisma News reported.

"We went after Iraq, they did not knock down the World Trade Center," Trump told his attendance, according to Infowars.

"It wasn't the Iraqis that knocked down the World Trade Center, we went after Iraq, we decimated the country.

"But it wasn't the Iraqis, you will find out who really knocked down the World Trade Center. Because they have papers in there that are very secret, you may find it's the Saudis, okay? But you will find out," Trump said.

The New York billionaire was referring to the 28 original pages of the Joint Congressional Inquiry into 9/11, which remain classified and withheld from the public on grounds of "national security."

Sources said the document implicated the Saudi Royal Family in providing funds to the terrorists.

Trump claimed that the Saudis are responsible for terrorism against the United States.

Earlier in the week, Trump said, "I know that the CIA and various other agencies knew that something bad was going to happen [prior to 9-11] and they did nothing about it. They got it wrong."

"The heads of the CIA and the various other agencies weren't speaking and it was a big problem," Trump added.

His comments prompted establishment Republicans and conservative talking heads to label him a 9/11 truther and a "radical kook."

Trump also noted that Saudi Arabia has just launched the "largest war game in the country's history" involving at least 20 countries.

He also acknowledged the prediction of political analysts Michael Synder that Saudi Arabia intends to invade Syria, together with Turkey and possibly involving aircraft from the U.S-led coalition in the region. Synder warned that such an invasion could precipitate World War 3 as Syria's main patrons—Iran and Russia—would not take it sitting down.