Los Angeles County sheriff's investigators say there may be as many as 20 unidentified victims of a man suspected of recording women in bathroom stalls at a Lancaster restaurant.

Officials say Jesus Calvario was arrested this week on suspicion of hiding in a stall at a Denny's and secretly recording women who came into the bathroom between Nov. 5 and 13. He is also accused of secretly recording a female relative on Nov. 9.

City News Service reports the 21-year-old pleaded not guilty Tuesday to charges including 21 misdemeanor counts of unauthorized invasion of privacy.

He faces up to 12 years in jail if convicted.