US federal officials are searching for more potential victims of a Texas man who recently pled guilty to cyberstalking women for almost three years in Colorado, Texas and Arizona.

Hugo Iram Cardona Jr, 21, used a scheme involving two-factor authentication – an electronic authentication method – to hack into the Snapchat accounts of at least 15 young women, then steal their intimate photos and videos, the US Attorney’s Office in the Western District of Texas reports.