Twelve more potential victims came forward this week after a couple in Southern California were charged with drugging and sexually assaulting two women they met on social outings, the authorities said.

Investigators in Orange County, Calif., believe there could be many additional victims, based on finding hundreds of videos of women who appear to be highly intoxicated on a phone belonging to one of the suspects, Grant Robicheaux.

Since the charges against Mr. Robicheaux, 38, and his girlfriend, Cerissa Riley, 31, were announced on Tuesday, at least 12 women have told the Orange County district attorney’s office that they, too, were victims, the office said on Friday. Investigators have received calls from dozens of potential victims in recent days.

At a news conference on Friday, Tony Rackauckas, the district attorney, urged women to come forward and vowed to safeguard the identities of those who did so.