Police have arrested three people and are looking for a fourth in two separate human trafficking cases, both involving 17-year-old victims allegedly forced into the sex trade.

Toronto police say they began investigating in November after a 17-year-old girl escaped from her alleged traffickers with the help of her family.

Police say the girl had been lured into the sex trade by a man who reached out to her and then picked her up from school, accompanied by a woman and another unidentified man.

Officers say the girl was forced to take photos of herself in various degrees of undress, which were then posted on a website advertising her sexual services.

They say the girl was taken to various motels and was allegedly forced to provide sexual services for money against her will.

They say that on Dec. 10, two men were arrested by Peel Regional Police on unrelated charges. A loaded firearm was found in the vehicle the two had been travelling in at the time of the arrest, as well as drugs.

Ten days later, one of those men was also charged in this trafficking case.

Patrick Agpoon, 22, and Atrooba Mughal, 19, both of Toronto, each face 16 charges that include trafficking in persons under the age of 18 by recruiting and material benefit from sexual services provided by a person under 18.

Police are still looking for a second man in that case.

The second investigation began on Dec. 27, police said. After another 17-year-old girl was forced into the sex trade by a man, she was allegedly trafficked throughout the GTA, and was forced to turn over her earnings and follow rules he imposed on her.

Police said he used intimidation and fear tactics to ensure her submission, including brandishing a firearm.

Police executed a search warrant in Peel Region on Dec. 28, and arrested a 26-year-old man.

Kristan Peter Miller, of Brampton, is facing 12 charges, including trafficking in persons under 18, forcible confinement and uttering threats of death or bodily harm.

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He appeared in court on Jan 4.

In both cases, police are concerned there could be more victims, and are asking for anyone with information to come forward.