Star Daniel Radcliffe told the Los Angeles Times that splitting JK Rowling's final book in two was the only sensible option for the film-makers.
"There have been compartmentalised subplots in the other books that have made them easier to cut - although those cuts were still to the horror of some fans," he told the paper.
"The seventh book doesn't really have any subplots. It's one driving, pounding story from the word go."
The first instalment of Harry Potter and The Deathly Hallows is due in autumn 2010, with part two scheduled for the following summer.
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