Lee and Carter are back, and this time they're in Hong Kong. Carter wants a relaxing vacation but Lee just wants to do police work. At a night club, Lee spots an evil agent named Ricky Tan, who runs an evil gang of counterfeiters, and his partner is a woman who delivers packages containing bombs. Lee and Carter follow these two aboard a boat where their attempted bust really busts, so Lee and Carter fly back to Los Angeles where they meet a woman in the Secret Service who helps them on their mission to find the counterfeiters. Lee and Carter are captured by the bad guys but soon escape into a sewer come emerge in downtown Las Vegas.
Answer: Although it's never shown, it was probably Ricky Tan's henchmen. Lee and Carter were outnumbered and decided to give up. After the fight, they were dropped off in the middle of a busy highway with no clothes on as a way to add insult to injury.