'Teenage Mutant Ninja Turtles' poster contains unfortunate 9/11 reference

The 'Teenage Mutant Ninja Turtles' movie hasn't even hit screens yet and it's already causing controversy.

Paramount Pictures' Australia branch released a poster of the upcoming movie that shows the half-shelled heroes jumping from a burning skyscraper. At the bottom it reads, "September 11."  Whoops. 

The picture was released on the Twitter account of Paramount Pictures Australia but has since been deleted after a lot of online backlash. Twitter users immediately called out the studio, with tweets like, 'When's the movie out?' 'September 11' 'OK. Poster's fine, can't think of anything it reminds me of.'

The new turtle action movie opens in the U.S. on August 8.