The Vancouver Island man who filmed three undercover police officers during peaceful demonstrations at the international summit in Montebello, Que., said he is disturbed by what he saw.

The YouTube video shows protester Dave Coles trying to stop masked men from approaching a line of riot police.

Nanaimo resident Paul Manley attended the summit to gather footage for a documentary and wound up videotaping three masked men who were pushing toward a line of riot police and turned out to be police officers themselves. The video ended up on YouTube. 

"It was really upsetting to see that,'' said Manley, who spoke to reporters Friday at the Tsawwassen, B.C., ferry terminal. "I've never felt so insecure in my own country."

He was referring to an incident that occurred while protesters were demonstrating against the Security and Prosperity Partnership, an agreement that was being discussed by U.S. President George Bush, Mexican President Felipe Calderon, and Prime Minister Stephen Harper in Montebello on Monday and Tuesday.

The incident has caused some to question the role of the three officers.

Dave Coles, president of the Communications, Energy and Paperworkers Union, was at the protest and claimed that the police officers "were trying to incite violence. They were trying to get others to throw rocks at the store."

Manley is calling for an investigation into the incident.

But federal Minister of Public Safety Stockwell Day rejected calls for an inquiry, saying that because the incident happened in Quebec, the province's complaints process will have to be followed.

Quebec provincial police admit that three of their officers disguised themselves as demonstrators during the protest at the summit, but they deny allegations that undercover officers were there on Monday to provoke the crowd and instigate violence.

"At no time did the police of the Sûreté du Québec act as instigators or commit criminal acts," the police force said in French in a news release. "It is not in the police force's policies, nor in its strategies, to act in that manner.

"At all times, they responded within their mandate to keep order and security," it said.

Still, Manley said he's worried about his own safety because of the attention he's received since videotaping the incident.

"Other protesters were saying, 'These guys are cops they're trying to get us to do things we shouldn't be doing," he said.