G20 riots in Canada are you ready TORONTO (AP) — Police conducted a large raid and rounded up more protesters Sunday in an effort to quell further violence at the global economic summit after black-clad youths rampaged through the city, smashing windows and torching police cruisers. Police said they have arrested more than 500 demonstrators, many of whom were hauled away in plastic handcuffs and taken to a temporary holding center constructed for the summit. "What we saw yesterday is a bunch of thugs that pretend to have a difference of opinion with policies and instead choose violence to express those so-called differences of opinion," Prime Minister Stephen Harper's chief spokesman Dimitri Soudas said Sunday.