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Calgary police have laid additional charges against a former board member of the Calgary Homeless Foundation accused of sexually assaulting vulnerable teens.

In March, police announced Robin Adair Wortman, 62, had been charged with sexual assault and assault with a weapon in relation to two incidents.

READ MORE: Calgary Homeless Foundation member removed from board after teen sex assault charge

In one, a 17-year-old boy reported he had been sexually assaulted. Police allege the teen accepted what he thought was crystal meth from Wortman, but was actually date-rape drug GHB. It’s alleged he was then sexually assaulted once he was incapacitated.

Watch below: Calgary Police Staff Sgt. Melanie Oncescu issues a statement after a man was accused of sexually assaulting and drugging a teenage boy.

1:21 Calgary police charge man with sexually assaulting, drugging teen and chasing another with a knife Calgary police charge man with sexually assaulting, drugging teen and chasing another with a knife

In the second incident, on Sunday, March 12, a 19-year-old man alleged Wortman had chased him down the hallway of a southwest apartment building with a large knife. The teen was unharmed.

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On Thursday, police announced new charges had been laid against Wortman after a 17-year-old came forward to police on May 31 to report he was sexually assaulted and forcibly confined in Wortman’s apartment. It’s alleged the incident took place in late 2016.

Police said a search warrant has since been executed on Wortman’s apartment.

He now faces additional charges of trafficking, making child pornography, distributing child pornography, possessing child pornography, accessing child pornography, luring, sexual assault, forcible confinement and sexual exploitation.

Anyone with information on the case is asked to call Det. Spence at 403-428-5457.

Anyone who believes they’ve been a victim of sexual assault is asked to contact the Calgary Police Service at 403-266-1234.

For more information about how to recognize signs of child abuse, please visit the Sheldon Kennedy Child Advocacy Centre website at www.sheldonkennedycac.ca.

WATCH: Advocate Sheldon Kennedy explains why it’s so important for victims of sexual abuse to tell their story.

1:28 ‘It’s important to tell your story’: Sheldon Kennedy ‘It’s important to tell your story’: Sheldon Kennedy

Wortman had been a member of the volunteer board at the Calgary Homeless Foundation for seven years. When news of his arrest reached the organization, an emergency meeting was called and Wortman was removed from the board.

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