Heroes in a half-shell — or al-Qaeda?

Contrary to what some conspiracy theorists say, the attacks of Sept. 11, 2001, were not an inside job.

And if they were, the Teenage Mutant Ninja Turtles were definitely not involved.

Yet Paramount Australia tweeted a promotional poster for the new “Turtles” flick featuring Leonardo, Raphael, Donatello and Michelangelo plunging from a burning building.

Release date down under? Sept. 11.

The company pulled the image within hours, Gawker reported. The problem? It had substituted the Australian release date on an American poster without realizing that date’s significance.

“We are deeply sorry to have used that artwork for the marketing materials promoting the September 11 opening in Australia,” Paramount Pictures Australia said in an e-mailed statement to Reuters. “Combining that image and date was a mistake. We intended no offence and have taken immediate action to discontinue its use.”