Calgary police and security at the University of Calgary are warning students after reports of a voyeur on campus.

Five women have filed complaints, saying they were followed by a man on campus who then put an iPhone camera up their skirts.

The first complaint came earlier this week and the other women came forward over the next few days. 

"This type of complaint is extremely rare on campus," Lanny Fritz, head of security with the university. "In my 16-year history with the university I've never had a situation where we're dealing with a case of voyeurism before."

A security alert has gone out to all 40,000 people on campus.

The practice known as "upskirting" has been in the news in recent months after a Massachusett's court ruled a man taking cellphone photos up the skirts of women riding the Boston subway did not violate any laws because the women were not nude or partially nude.

In Canada, surreptitiously photographing up women's skirts or recording video of the same view is punishable under the voyeurism section of the Criminal Code.

Anyone found to have made upskirt images, or similar images where the victim had a "reasonable expectation of privacy," for a sexual purpose faces up to five years behind bars.