Jackson said that given the richness of the story -- which is set 60 years before "The Lord of The Rings" -- he decided after wrapping up shooting recently in New Zealand that what was originally planned as two movies would now be a trilogy.

"I'm delighted that New Line, MGM and Warner Bros. are equally enthusiastic about bringing fans this expansive tale across three films," Jackson said in a statement.

"It has been an unexpected journey indeed, and in the words of Professor Tolkien himself, 'a tale that grew in the telling'," Jackson said in a statement on his Facebook site.

"The Hobbit," written by J.R.R. Tolkien, is the prequel to the British author's epic fantasy "The Lord of the Rings," which Jackson made into three Oscar-winning films about 10 years ago.

A spokesman for New Line said the third "Hobbit" film would be released in the summer of 2014. The first two "Hobbit" movies, starring British actor Martin Freeman as Bilbo Baggins, have already been announced for release in December 2012 and December 2013.

"It is only at the end of a shoot that you finally get the chance to sit down and have a look at the film you have made," Jackson said on his Facebook page.

"We know how much of the story of Bilbo Baggins, the Wizard Gandalf, the Dwarves of Erebor, the rise of the Necromancer, and the Battle of Dol Guldur will remain untold if we do not take this chance," he added.

(Reporting by Jill Serjeant; Editing by Christine Kearney and Dale Hudson)

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