On October 18th 2015 (over a year ago), a satirical/fake news site "World News Daily Report" published a fake news story about Donald Trump, saying:
RICHMOND, VA | Donald Trump, the GOP’s 2016 front-runner, brought his campaign to Henrico County on Wednesday night, where he made an unexpected statement after answering a series of questions from the crowd.
Pressed on the subject of the September 11, 2001 terrorist attacks and what he would do to prevent such a thing from happening again, the presidential candidate known for his brash answers completely took his supporters by surprise.
“First of all, the original 9/11 investigation is a total mess and has to be reopened” he told the crowd of supporters. “How do two planes take out three buildings in the same day? I never got my head around the fact that nothing is mentioned about the destruction of Building 7 in the 585 page document” he explained, talking about World Trade Center 7 which also collapsed during the September 11 attacks.
This story appears to be almost entirely fake. Trump did give a rally speech in Richmond, Henrico County, on Oct 14th 2015. However the speech makes no mention of 9/11 and Trump does not answer questions from the crowd.
The "World News Daily Report" is also obviously fake, even stating:
The site also has numerous ludicrous clickbait stories.
Unfortunately the story was regurgitated by the lower end of online media. First reappearing today (November 11th, 2016) on "Your News Wire" a clickbait site that focusses on Conspiracy Theories. They simply cut and paste the WNDR fake story, and added a few paragraphs.
Then it was was repeated by the UK's "Daily Star" tabloid site, and widely repeated by hopeful 9/11 conspiracy theorists on social media.