A 54-year-old teacher is facing sexual assault charges, dating back more than 26 years.

York Regional Police say the alleged crimes happened between 1983 and 1984, in Toronto and Markham.

The two female victims were 14-year-old students at the time, attending a private school that was temporarily located in Toronto.

Martin Nicholls of Vaughan is charged with six counts of sexual assault. He was arrested at a Vaughan high school on Friday.

Police say the investigation is ongoing. Anyone with information should call the crimes against children unit at 1-866-876-5423, ext. 6034.