In the last several weeks, Liquor Commission officials have received a handful of troubling reports, including a woman who ended up nude on a Waikiki beach; a man who woke up naked behind the Imax theater and had been robbed of money and a laptop computer; and a woman who last remembered being driven in her own car by a stranger who was rifling her purse. She ended up in her house but couldn't recall getting home.

One of the female victims last remembered meeting her friend for lunch at the same unidentified restaurant/bar, said Jeff Smith, chief investigator for the Honolulu Liquor Commission.

"There is commonality," Smith said. "At least four of the victims were at the same bar."

Smith and Dewey Kim, the Liquor Commission's administrator, declined to identify the restaurant/bar because the management and employees are cooperating with the investigation and Kim believes they are not involved in the attacks.