A Calgary man is facing charges in connection with the assault and robbery of sex trade workers in downtown Calgary.

Police say they first received information about past assaults on sex trade workers back in April 2012 but they were unable to locate the victims.

Investigators say two assaults were later reported to them on Saturday, June 23, 2012 and Sunday, October 7, 2012.

In each case, it is alleged that a man approached a sex trade worker downtown, agreed upon the exchange of sex for money and later forcibly robbed the woman at knifepoint.

Tyson Edward Brown, 21, of Calgary, was arrested without incident on Thursday, November 15 and is charged with two counts each of assault with a weapon, robbery and uttering threats.

Police say that they are still gathering information on similar incidents but it is not yet known if other incidents are related.

They believe that in one case in 2011 a distinctive red sports car, with a right hand drive, may have been involved but they have not been able to contact the alleged victim.

Anyone with information on this type of incident is asked to call Cst. Cowick of the District 1 Operations Team at 403-567-6100 or Crime Stoppers anonymously using any of the following methods:

TALK: 1-800-222-8477
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TEXT: tttTIPS to 274637