Protesters marked the anniversary of the Occupy Wall Street movement today with rallies in more than 30 cities around the world, including a march on the New York Stock Exchange, not far from the park where the movement was born.

Police say more than 100 people have been arrested as Occupy Wall Street protesters march in small groups around Manhattan’s financial district. Police also removed four protesters in wheelchairs after they blocked a busy street Monday.

Loud chanting and the sound of drums filled the air. The demonstrators clogged traffic, and dozens of police officers and vans lined the streets.

But as the last of its urban encampments close and interest wanes in a movement without an organizational hierarchy or an action agenda, it’s unclear whether Occupy’s first birthday will be its last.

Read More: USA Today