Detectives Lee and Carter may be back for a fourth film in the popular Rush Hour action-comedy franchise.

In a post on his Instagram account, actor Chris Tucker shared a photo with his co-star Jackie Chan. The photo shows the two men each holding up four fingers, hinting at a possible sequel to 2007's Rush Hour 3.

RELATED: Cobra Kai Season 2 Trailer Teases the Series' Growing Miyagi-verse

The martial arts-comedy series began in 1998, with the first film seeing Chan's Hong Kong Police Force Chief Inspector Lee arriving in Los Angeles to investigate the kidnapping of the consulate's daughter. The case forces him into an impromptu team-up with LAPD Detective James Carter. The runaway success of the first film would lead to two sequels, which took the action odd couple to Hong Kong, Las Vegas and Paris for other high-octane assignments.

RELATED: Warrior Nun: Netflix Finds the Cast for Its Next Comic Book Adaptation

A television adaptation aired on CBS in 2016 as a mid-season replacement, only to be cancelled after a single season due to low ratings and poor critical response.

A fourth Rush Hour film has been in various stages of development since 2007, with previous reports indicating the story may take place in Moscow to keep with the film series' theme of new global settings in each installment.