The Oscar-winning director of Aliens and Titanic said he is working on three new Avatar films at the same time, according to BBC News.
The first film was supposed to be out in December 2016, but Cameron said writing the stories had become "very involved".
"There`s a layer of complexity in getting the story to work as a saga across three films," he explained.
Cameron said the goal was to have the scripts for the three movies completed by the end of this month so that filming can begin.
"We`re writing three simultaneously and we`ve done that so that everything tracks throughout the three films," he told the Associated Press.
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