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Police in London, England, fan out to provide security during the G20 gathering in that city in June 2009.

Security for next month's G8 and G20 summits will cost Canadian taxpayers at least $833 million.

Figures released Tuesday by the federal government reveal $654 million in new money, on top of $179 million already earmarked. And the tally could grow another $100 million, according to the office of Public Safety Minister Vic Toews.

"As we have always stated, overall costs will be finalized following the completion of the summits," Toews' office said in a statement. "However, based on a medium-level threat assessment, we've budgeted up to $930 million for security."

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The numbers show the RCMP — which is leading the massive effort — will receive an additional $321 million, while the Public Safety Department gets $262 million.

Funds will also go to the Defence Department, the Canadian Security Intelligence Service, the national air transportation security authority and a clutch of other agencies.

G8 leaders gather in Huntsville, Ont., late next month, then join other world leaders for the G20 summit in Toronto.

The money will be used for planning, accommodation, information technology, and working with security partners to protect leaders and their delegations.

"Global security begins at home. As hosts of the G8 and G20 summits we will be prepared to respond to any possible situation or threat," the statement said. "And we will take all measures necessary to ensure Canadians, delegates and international visitors remain safe."