OTTAWA - Possible threats against sponsors of next year's Vancouver Olympics have federal security agents wringing their hands over ''extremist elements,'' a newly released intelligence report reveals.

The report by the government's threat assessment centre cites vandalism of a corporate backer's premises, theft of the Games flag, and skirmishes between protesters and police during unveiling of the Olympic countdown clock.

The Royal Bank of Canada, a key Games sponsor, ''has been named specifically in anarchist and anti-Olympic Internet postings,'' notes the analysis, 2010 Vancouver Winter Olympics: Terrorist Threat to Vancouver Area Facilities.

Between September 2007 and last May, anarchists claimed responsibility for four attacks in which large rocks were thrown through the windows of Vancouver Royal Bank branches, says the assessment under a section titled Domestic Non-Islamist Extremist Groups.

''Extremist elements . . . have publicly stated their intent to continue acts of protest and possible violence against both the Olympics and commercial symbols they perceive to represent the 2010 Olympic Games.''

The threat assessment also looks at Osama bin Laden's al-Qaida network and radicals inspired by the terrorist movement, as well as ''Lone Wolf'' attackers like Kimveer Gill, a gunman who killed one student and wounded 19 others at Montreal's Dawson College.

The document was prepared last July by the Integrated Threat Assessment Centre, which includes representatives of the Canadian Security Intelligence Service, the RCMP and several other security and police agencies. A copy was recently released along with other assessments to The Canadian Press under the Access to Information Act.

Several portions of the threat assessments, labelled For Official Use Only, were withheld from disclosure.

Chris Shaw, spokesman for Games monitoring group 2010watch, found the reports amateurish.

''This is the best they can do?'' he asked.

''These guys need to get a serious grip, frankly. I think they're really confusing legitimate political dissent, however disruptive it might be, with a threat. And it's simply not.''

More than 5,000 athletes are expected from 80 countries at the Winter Games, to begin next February in Vancouver and Whistler, B.C.

Numerous activists, from aboriginal groups to anti-poverty fighters, oppose the Games, saying the expensive mega-event will hurt Vancouver's poor, damage the environment and drain provincial coffers.