Thousands of protesters have taken over the streets of downtown Toronto as isolated groups of demonstrators smashed windows and confronted riot police. A crowd of black-clad protesters with bandanas covering their faces moved around the city centre, damaging property along the way. Several police cruisers were vandalized and two were lit ablaze as flames and black smoke billowed into the air. Sparks flew into the air from small explosions. Firefighters finally arrived after about 15 minutes. Tear gas was deployed at College Street and University Avenue shortly after 4:30 p.m. ET, but a police spokesman said he did not know whether it was used by police or protesters.

The next G20 meeting will have to be held on the International Space Station—or how about a nice little teleconference?