Protesters in Oakland, California
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Protesters march on Oakland port

Several thousand protesters have gathered in Oakland, California, in a demonstration aimed at expanding on the broader Occupy Wall Street movement.

Anti-corporate greed demonstrators in California have forced one of America's busiest ports to close.

Protesters marched on the Port of Oakland at the end of a day which saw thousands of workers in the city out on strike.

Wednesday's walkout was spurred by an incident at a protest last week in which a military veteran was seriously injured.

Ex-Marine Scott Olsen, 24, was struck on the head with a tear gas canister during clashes between demonstrators and police.

Alastair Leithead has more details.