Mariam Mahkniashvili was last seen on Sept. 14.Mariam Mahkniashvili was last seen on Sept. 14. (Toronto Police Service)

Toronto police returned to Forest Hill Collegiate Institute on Monday, in their latest attempt to turn up any clue to the disappearance of Mariam Makhniashvili.

Investigators will conduct interviews with students to try to shake loose anything that might help in their hunt for the teen who disappeared on Sept. 14.

Mahkniashvili, who has turned 18 since she disappeared, was last seen when she headed to school with her brother.

She chose to use a different door to enter the school and has not been seen since.

In October her backpack containing her books and notebooks was found in a parking lot near Yonge Street and Eglinton Avenue West.

Police have conducted dozens of searches. Last week they began door-to-door searches in her neighbourhood and later sent officers to a garbage transfer station in the hope of finding something connected with the case.

'Nobody remembers things from two months ago'

On Monday morning about 20 officers started interviewing each of the 980 students at Forest Hill Collegiate.

Principal Peggy Atchison said police hope to find any students who may have taken the same route as Mahkniashvili the morning she disappeared.

Earlier in the investigation, police asked students to think about the morning of Sept. 14, but not one student remembered even talking to Mahkniashvili during her first few weeks at the school.

Vlada Replete, a student at the school, said Monday she was unsure why police waited so long to ask again.

"If they started earlier. I think more information would come up," she said. "It would easier for them to get stuff from kids, because nobody remembers things from two months ago."

On Friday, Det.-Sgt Dan Nealon, who is in charge of the case, said last week's decision to send 60 investigators into the area bounded by Bathurst Street, Eglinton Avenue, Shalamar Boulevard and Chaplin Crescent received 100 per cent co-operation from the public. Not one person has refused police entry to their home or property, he said.