Meanwhile, the leaders of the Group of Eight - the world's seven richest nations and Russia - discussed poverty, the environment and other issues.

The crowd of protesters was among the largest to date

Police were out in force

Some of the demonstrators turned to violence

Police used force against protesters

There were injuries on both sides

Despite the seriousness, there were light moments

Rock stars lobbied world leaders on debt relief

Some protesters sensed victory...

...while some saw the day in different terms ...

... and others mourned Friday's shooting victim