It's been 23 years since terrorists hijacked four commercial airplanes in a coordinated attack that killed 2,977 people in New York, Washington, D.C., and Pennsylvania on Sept. 11, 2001.

Though Americans alive at the time overwhelmingly remember exactly where they were when they heard the news, that collective memory hasn't stopped false conspiracy theories and fabrications from spreading and reemerging online more than two decades later, targeting everything from the cause of the attacks to the response that followed.

Here are a few of the claims USA TODAY has previously debunked.

The claim: Congress is considering a bill that would criminalize questioning 9/11

Our rating: False

There is no such legislation mentioned on bill tracking websites or in legitimate news outlets. The image is a cropped version of a fabricated New York Post article.

Full fact check: Claim of bill banning certain 9/11 speech is baseless, uses fabricated news story

The claim: Trump said there was no attack on the World Trade Center

Our rating: False

Former President Donald Trump did not say there was no World Trade Center attack. The full video makes it clear he said that kind of attack did not occur during his presidency because of the measures he had implemented.

Full fact check:False claim Trump said World Trade Center attack didn't happen in speech

The claim: Image shows George W. Bush meeting with Osama bin Laden

Our rating: Altered

The image has been digitally altered. The original image...

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