OLYMPIA, Wash. - At least a dozen people were arrested in Olympia on Saturday as demonstrators rallied to protest military-cargo shipments at the port in Washington's state capital.

Saturday's actions by police come one day after protesters were able to halt two trucks from removing military equipment that had been unloaded from a ship coming from Iraq. The equipment was bound for Fort Lewis, an Army base about 15 miles northeast of Olympia that is home to Stryker combat brigades.

Protesters on foot blocked traffic downtown about noon Saturday by jumping in front of large trucks towing cargo containers carrying military equipment.

Olympia police in riot gear moved in quickly, spraying pepper spray in the faces of the protesters, pushing them with their batons and dragging them away from the road.

"We ask them initially to please leave and we give them lots of warnings and lots of time, but there comes a point where that's our only option," said Tor Bjornstad, of the Olympia Police Department.

At least three people were arrested at that location, and at least nine more were arrested when they tried to block an entrance to Interstate 5 as scores of protesters deployed to several different locations.

The protest was part of a weeklong series of demonstrations by the group Olympia Port Militarization Resistance. They have been protesting the use of the port by the USNS Brittin, which landed at the port Monday to unload equipment that was used in Iraq by the 3rd Brigade, 2nd Infantry Division (Stryker Brigade Combat Team).

"This is a movement that people all around the world need to start joining in," said Sam Green, protester.

At the port's gates, protesters wearing goggles and other protective gear withstood several rounds of pepper spray but were physically removed by officers who picked them up and threw them away from the road they had blocked, The Olympian newspaper reported.

On Friday, protesters, including several small children, were able to keep two trucks from leaving the port. Olympia police said the department did not have enough officers available to remove the protesters Friday, and that they were not prepared to physically remove children.