Police arrest a man during a protest at the G20 summit in Toronto June 27, 2010. Police in Toronto fired tear gas on protesters for a second straight day on Monday as new violence surrounding the G20 summit erupted and the arrest tally climbed toward 600. REUTERS/Christinne Muschi (CANADA - Tags: CIVIL UNREST POLITICS IMAGES OF THE DAY) 

A man sticks his tongue out at a police officer after being arrested during a protest at the G20 summit in downtown Toronto June 27, 2010. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

Police help a woman in a motorised wheelchair after surrounding protesters during a G20 march in Toronto June 27, 2010. Police in Toronto fired tear gas on protesters for a second straight day on Monday as new violence surrounding the G20 summit erupted and the arrest tally climbed toward 600. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

A man stands in front of police officers amid arrests during a G20 march in downtown Toronto, June 27, 2010. Police in Toronto fired tear gas on protesters for a second straight day on Monday as new violence surrounding the G20 summit erupted and the arrest tally climbed toward 600. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

A man comforts his girlfriend as police officers close in on a crowd of G20 protesters, making individual arrests in downtown Toronto June 27, 2010. Police in Toronto fired tear gas on protesters for a second straight day on Monday as new violence surrounding the G20 summit erupted and the arrest tally climbed toward 600. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST IMAGES OF THE DAY) 

A man burns a Canadian five-dollar note during a protest at the G20 summit in Toronto June 27, 2010. Police in Toronto fired tear gas on protesters for a second straight day on Monday as new violence surrounding the G20 summit erupted and the arrest tally climbed toward 600. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST IMAGES OF THE DAY BUSINESS) 

A man lies on the ground after being arrested by police in Toronto June 27, 2010. Police in Toronto fired tear gas on protesters for a second straight day on Sunday as new violence surrounding the G20 summit erupted and the arrest tally climbed above 500. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

A woman is arrested by police at the University of Toronto campus in Toronto June 27, 2010. A "large number" of people were detained in a raid at the University of Toronto's downtown campus, and police said they seized weapons, including bricks, rocks and sticks. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

A woman avoids police in riot gear as she takes part in a "critical mass" bicycle demonstration against the G20 Summit in downtown Toronto June 27, 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS) 

An arrested man sits at the University of Toronto campus, June 27, 2010. About 70 people were arrested without incident at a building on the University of Toronto Campus, suspected of contributing to civil disorder in protests against the G20 Summit. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS) 

Police officers run during a protest at the G20 summit in Toronto June 27, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS) 

A detainee arrested at yesterday's G20 Summit protests, gestures to a crowd of supporters after being released from Toronto Detention Centre June 27, 2010. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS CIVIL UNREST) 

A supporter waits for detainees arrested in yesterday's G20 Summit protests to be released from Toronto Detention Centre June 27, 2010. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS CIVIL UNREST) 

A man is escorted after being arrested by police at the University of Toronto campus in Toronto June 27, 2010. A "large number" of people were detained in a raid at the University of Toronto's downtown campus, and police said they seized weapons, including bricks, rocks and sticks. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

People are led away at the University of Toronto campus, June 27, 2010. About 70 people were arrested without incident at a building on the University of Toronto Campus, suspected of contributing to civil disorder in protests against the G20 Summit. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS) 

A man is led away at the University of Toronto campus, June 27, 2010. About 70 people were arrested without incident at a building on the University of Toronto Campus, suspected of contributing to civil disorder in protests against the G20 Summit. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS) 

A man flashes a peace sign after being arrested by police at the University of Toronto campus in Toronto, June 27, 2010. About 70 people were arrested without incident at a building on the University of Toronto campus, suspected of contributing to civil disorder in protests against the G20 Summit. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

Police rest in the back of a van during demonstrations against the G20 summit in downtown Toronto June 26, 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS) 

A young protester taunts riot police near the Provincial Parliament buildings in Toronto June 26, 2010. Masked protesters rioted across downtown Toronto on Saturday, setting police cars ablaze and smashing store windows in a violent show of opposition to the G20 summit. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS CIVIL UNREST) 

A man holds a sign in front of a burning police car during a protest against the G20 summit in downtown Toronto, June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: POLITICS CIVIL UNREST) 

A man does a headstand in front of a burning police car during a protest against the G20 Summit in downtown Toronto, June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: POLITICS CIVIL UNREST IMAGES OF THE DAY) 

A demonstrator pauses during a protest of the G20 Summit in Toronto June 26, 2010. REUTERS/John Hryniuk (CANADA - Tags: CIVIL UNREST POLITICS) 

A protester lies bleeding as he is detained by riot police during a demonstration against the G20 summit in Toronto, June 26, 2010. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

A protester carries an imitation casket marked "Democratie" through the streets in the midst of protests against the G20 summit in Toronto June 26, 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS IMAGES OF THE DAY) 

A police officer in riot gear walks in front of a burning police car during a protest against the G20 summit in downtown Toronto, June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: POLITICS CIVIL UNREST IMAGES OF THE DAY) 

A police car set on fire by anarchist demonstrators burns in the midst of protests on the streets of Toronto, during the G20 summit June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS IMAGES OF THE DAY) 

Police in riot gear stand guard in front of activists during a protest ahead of the G20 Summit in downtown Toronto, June 25, 2010. About 2,000 protesters thronged Toronto on Friday in the biggest rally yet against the G20 summit, facing off against police in riot gear just blocks from the U.S. consulate. REUTERS/Mark Blinch (CANADA - Tags: POLITICS CIVIL UNREST) 

Police officers in riot gear walk in front of a burning police car as they try to contain a protest against the G20 summit in downtown Toronto June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST CRIME LAW POLITICS IMAGES OF THE DAY) 

A protester carries a rainbow-colored peace flag through the streets in the midst of protests against the G20 summit in Toronto June 26, 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS) 

An anarchist demonstrator smashes the windows of Bank of Nova Scotia during protests against the G20 summit in downtown Toronto, June 26, 2010. REUTERS/Saul Porto (CANADA - Tags: CIVIL UNREST POLITICS IMAGES OF THE DAY) 

The window of a Scotiabank smashed by anarchist demonstrators is seen during the G20 summit in downtown Toronto, June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CONFLICT POLITICS) 

Riot police on horseback move through the streets of downtown Toronto in the midst of protests against the G20 summit in Toronto, June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS IMAGES OF THE DAY ANIMALS) 

Police officers in riot gear walk in front of a burning police car during a protest against the G20 summit in downtown Toronto, June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: POLITICS CIVIL UNREST) 

A demonstrator yells in front of a line of riot police during a protest against the G20 Summit in downtown Toronto June 26 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS) 

A police officer peers out through a locked gate inside the perimeter fence leading to the Metro Toronto Convention Centre G20 Summit site in Toronto June 26, 2010.
REUTERS/ Mike Cassese (CANADA - Tags: POLITICS CIVIL UNREST) 

A protester yells at riot police in the midst of protests against the G20 summit on the streets of Toronto June 26, 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS) 

A demonstrator wears a matching respirator during a protest of the G20 Summit in Toronto June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS) 

Demonstrators take part in a protest ahead of the G20 Summit in downtown Toronto June 25, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS) 

Demonstrators wave the Canadian flag during a protest ahead of the G20 Summit in downtown Toronto, June 25, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS) 

A protester stands in front of a group of riot police blocking protesters from Simco St. during protests over the G20 Summit in downtown Toronto, June 26, 2010. REUTERS/Chris Roussakis (CANADA - Tags: POLITICS CRIME LAW CIVIL UNREST) 

Police in riot gear form a line in the street during a demonstration in downtown Toronto, June 25, 2010 ahead of the G20 summit. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS CRIME LAW) 

Police officers stand behind their bicycles as protesters are stopped by a line of officers behind a burnt police car during G20 Summit protests in downtown Toronto June 26, 2010.
REUTERS/ Mike Cassese (CANADA - Tags: CIVIL UNREST POLITICS) 

A car burns during a protest of the G20 summit in Toronto June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS) 

Police officers detain a protester during a demonstration at the G20 summit in Toronto, June 26, 2010. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

A protestor is knocked to the ground by advancing police during a demonstration in downtown Toronto, Canada June 26, 2010 during the G20 summit in Toronto. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS) 

Police officers detain a protester during a demonstration at the G20 summit in Toronto, June 26, 2010. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

A police car set on fire by anarchist demonstrators burns in the midst of protests on the streets of Toronto during the G20 summit, June 26, 2010. REUTERS/Saul Porto (CANADA - Tags: CONFLICT POLITICS) 

A protester juggles in front of riot police during a demonstration against the G20 summit, in downtown Toronto June 25, 2010. Activists, labor groups and other protesters demanding Group of 20 (G20) countries do more to fight poverty marched through downtown streets but were blocked by police as they neared the security zone authorities have established around the venue for the summit on Saturday and Sunday. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST SOCIETY) 

Police and protestors clash during a demonstration in downtown Toronto, June 25, 2010 ahead of the G20 summit. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS CRIME LAW) 

Protester Roman Toutissani stands at the corner of Simcoe and Front Street near the Toronto Convention Centre, site of the G20 Summit, June 25, 2010. Toutissani was looking for support and donations to veterans of the Russian army. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS CIVIL UNREST) 

World Vision protesters dressed as U.S. President Barack Obama, (L) France President Nicolas Sarkozy and Canadian Prime Minister Stephen Harper (R) participate in a demonstration while standing on stilts on the town dock of Huntsville, Ontario June 25, 2010. World Vision was asking the G8 leaders to keep their financial promises they will make at the G8 Summit, underway today and tomorrow at The Deerhurst Resort in Huntsville. REUTERS/Carlo Allegri (CANADA - Tags: POLITICS CIVIL UNREST) 

World Vision protesters dressed as Italian Prime Minister Silvio Berlusconi (L) and Canadian Prime Minister Stephen Harper (R) participate in a demonstration on the town dock of Huntsville, Ontario June 25, 2010. World Vision was asking the G8 leaders to keep their financial promises they will make at the G8 Summit, underway today and tomorrow at The Deerhurst Resort in Huntsville. REUTERS/Carlo Allegri (CANADA - Tags: POLITICS CIVIL UNREST) 

Firefighters and riot police work to extinguish a fire in a police vehicle set by anarchist demonstrators in the midst of protests on the streets of downtown Toronto during the G20 summit in Toronto June 26, 2010. REUTERS/Jill Kitchener (CANADA - Tags: CIVIL UNREST POLITICS) 

A demonstrator makes a peace sign in front of a line of riot police during protests on the streets of downtown Toronto, during the G20 summit June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS IMAGES OF THE DAY) 

A smashed Scotiabank automated teller machine (ATM) destroyed by anarchist demonstrators is seen during protests against the G20 summit in downtown Toronto June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CIVIL UNREST POLITICS) 

Demonstrators dance through the streets during a protest against the G20 Summit in downtown Toronto June 26, 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST POLITICS) 

Police officers clash with protesters during a demonstration at the G20 summit in Toronto, June 26, 2010. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

Police officers detain protesters during a demonstration at the G20 summit in Toronto, June 26, 2010. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS CIVIL UNREST) 

Police rush at protesters demonstrating against the G20 summit as a police vehicle burns in downtown Toronto June 26, 2010. REUTERS/Mike Segar (CANADA - Tags: CIVIL UNREST CRIME LAW POLITICS) 

A man plays a guitar in front of a burning police car during a protest against the G20 summit in downtown Toronto June 26, 2010. REUTERS/Mark Blinch (CANADA - Tags: CRIME LAW CIVIL UNREST POLITICS)