Black-clad demonstrators broke off from a crowd of peaceful protesters at the global economic summit in Toronto Saturday, torching police cruisers and smashing windows with baseball bats and hammers. Police arrested more than 150 people. Police used shields, clubs, tear gas and pepper spray to push back the rogue protesters who tried to head south toward the security fence surrounding the perimeter of the Group of 20 summit site. Some demonstrators hurled bottles at police. "We have never seen that level of wanton criminality and vandalism and destruction on our streets," Toronto police chief Bill Blair said. The roving band wearing black balaclavas shattered shop windows for blocks, including at police headquarters, then shed some of their black clothes, revealing other garments, and continued to rampage through downtown Toronto. Protesters torched at least three police cruisers in different parts of the city, including one in the heart of the city's financial district. One protester jumped on the roof of one before dropping a Molotov cocktail into the smashed windshield.