reuters
reuters:

Occupy Oakland demonstrators shield themselves from an exploding tear gas grenade during a confrontation with the police near the Oakland Museum of California in Oakland, California January 28, 2012.
Police fired tear gas at hundreds of Occupy Oakland protesters who tried to take over a shuttered convention center on Saturday, arresting 19 people in the latest clash between anti-Wall Street activists and authorities in the California city. [REUTERS/Stephen Lam]
Read more: Police fire tear gas at Oakland protesters, 19 arrested

reuters:

Occupy Oakland demonstrators shield themselves from an exploding tear gas grenade during a confrontation with the police near the Oakland Museum of California in Oakland, California January 28, 2012.

Police fired tear gas at hundreds of Occupy Oakland protesters who tried to take over a shuttered convention center on Saturday, arresting 19 people in the latest clash between anti-Wall Street activists and authorities in the California city. [REUTERS/Stephen Lam]

Read more: Police fire tear gas at Oakland protesters, 19 arrested