Harrison Ford has threatened to quit the new Indiana Jones movie, unless he gets to use a real whip. The 64-year-old actor, who plays the daredevil archaeologist, was told the weapon would have to be computer generated because of new film safety rules. Harrison branded the rule "ridiculous" and said he would pull out of the film if he couldn't wield his whip.

A source said: "The idea was to take away the risk element the whip carries. Safety laws have changed since the last film and movie makers have to be much more careful. Now they use computer graphics for any dangerous stuff."

Harrison was 39-years-old when the first Indiana Jones movie, Raiders Of The Lost Ark was released in 1981. The Temple Of Doom followed in 1983 and The Last Crusade five years later. The trilogy made more than $1.1 billion at the box office. The fourth movie is due for release next year.