The trial of a man accused of assaulting 10 minors began yesterday at a courthouse in Montreal.

Walid Mustapha Chalhoub faces 48 charges, including sexual assault, pimping, extortion and kidnapping.

According to police testimony, Chalhoub allegedly attracted victims to his home by promising them jobs and cash.

Police allege Chalhoub then engaged in blackmail to extort money and force the teenagers to film sex tapes.

He is also alleged to have threatened to upload the sex tapes to the internet to extort more money. 

A detective working on the case told the court the investigation began after a father called 911 to report his daughter's disappearance.   

That report led police to other alleged victims.

The first witness in the trial took the stand on Tuesday afternoon.

The trial is expected to last three weeks, and is expected to hear from 14 witnesses.