On Saturday, over 100,000 demonstrators marched in Copenhagen protesting their dissatisfaction with the climate change talks. It was a mostly peaceful protest until youths clad in black began throwing bricks and smashing windows. Police ended up arresting 968 protesters, including close to 400 members of European militant group Black Blocs. Most were released by the next day. Indoors, delegates spent the weekend working towards an agreement, after a draft blue-print that was put forward on Friday was widely criticized by many of the countries involved.