Jackie Chan and Chris Tucker hinted at a fourth Rush Hour film in a photo on Tucker's Instagram account.
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The photo shows the two co-stars holding up four fingers to tease a return to the action-comedy franchise.
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The film series began in 1998 and paired two mismatched detectives, leading to two successful sequels.
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CBS commissioned a television adaptation in 2016, only to cancel the series after a single season.
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A fourth Rush Hour film has been in various stages of development since 2007, with reports that it may take place in Moscow.
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