Hollywood mogul Frank Marshall has vowed to keep his upcoming movie projects veiled in secrecy in future following a "ridiculous rumour" which falsely named Bradley Cooper as the next INDIANA JONES.

The producer, who brought four Indiana Jones movies to the big screen, is said to be working on a fifth instalment in the franchise, and editors at Latino-review.com sparked gossip by suggesting Cooper could be a good candidate to take over from the from original star Harrison Ford.

The speculation eventually reached Marshall, who was outraged by the untrue rumour and has now declared a blackout on all his upcoming projects.

He writes in a series of posts on Twitter.com, "Due to the ridiculous rumours that keep popping up, like agents pipe dreams, I will stop commenting on our projects until I have real news... I can only confirm that Katy Perry will Not be the new Indiana Jones."