A demonstrator suffered a serious injury Saturday night outside of the Mark O. Hatfield Federal Courthouse in downtown Portland.
Portland Police say federal agents use munitions, CS gas and a long range acoustic device during more than five hours of demonstrations.
Donvan LaBella was hit in the head by a projectile causing a serious injury that required surgery.
Governor Brown released a statement condemning the violence.
Portland Mayor Ted Wheeler says the U.S. Marshall Service will investigate the incident.