Apple's iron-fisted control over the App Store has been called into question again with the news that the company has blocked a rival mobile browser.

Apple has blocked Opera web browser from the iTunes App Store, according to an article in The New York Times.

Jon Stephenson von Tetzchner, Opera's co-founder and chief executive told the New York Times that:

"Opera’s engineers had developed a version of Opera Mini that can run on an Apple iPhone, but Apple wouldn't let the company release it because it competes with Apple’s own Safari browser."

Apple has stated in the past that no porn or malicious apps would be allowed on the store, but it appears anything that rival's Apple own products is also being excluded.