BARCLAY, Md. -- A 90-year-old Prince George's County man, who is suspected of raping two minors at an Eastern Shore private school in the late 1960s, has been arrested Maryland State Police said.

Russell Isaac, of Bowie, Md., is charged with multiple counts of rape and associated sex offenses. He was arrested Monday morning at his home and is being held at the Prince George's County Detention Center.

The MSP investigation began in May 2016 when a female victim came forward and told police that she was sexually assaulted as a 14-year-old student at the W.C. Moffett School in Barclay, Md. where Isaac was the principal in the late 1960s.

Investigators identified a second victim who also reported that she was sexually assaulted by Isaac when she was 15, police said.

The victims told police the sexual assaults occurred at the school between 1966 and 1968.

Investigators believe there may be more victims. Anyone with information is asked to call 410-758-1101.