A 45-year-old Brampton high school teacher accused of having a sexual relationship with a 16-year-old student is now being accused of a second inappropriate relationship with another teen.

The alleged relationship between the teacher and the teen girl, who is now 17 years old, developed at Heartlake Secondary School.

Peel Regional Police’s Special Victims Unit is investigating the case.

Police arrested a suspect Tuesday and charged him with one count of sexual exploitation in connection with an alleged interaction with a 16-year-old girl.

Since then, police say another former student – a 17-year-old girl -- has come forward with similar allegations.

A suspect identified as Douglas Dale is now facing two additional charges, bringing the total charges to one count of sexual assault and two counts of sexual exploitation.

None of the charges have been proven in court.

Heartlake Secondary School Principal Peter Koehnen informed students, families and staff of the new charges in a letter Friday.

"Mr. Dale will remain assigned to home pending the disposition of the charges. Heart Lake staff and the Peel District School Board continue to co-operate fully with the police during their investigation," Koehnen said.

He’s due to appear in a Brampton court on July 10.