PORTLAND, Ore. — Authorities handcuffed several Oregon protesters who tried to block a bus from taking immigrants to a Tacoma, Washington, detention center.

Dozens of protesters lined up Wednesday afternoon outside a U.S. Immigration and Customs Enforcement facility in Portland. They blocked the entrance and exit for several hours while several activists linked themselves together.

Federal Protective Services officers started arresting protesters at about 5:30 p.m. The agency has not said how many were detained. The Portland Mercury reported that six people were handcuffed — three members of the chain and three of their supporters.

Videos showed Portland police placing hoods over the heads of protesters who were bound together.

Portland police Sgt. Chris Burley said that was done for protection, because officers initially believed they needed spark-prone power tools to separate them.

Burley said Portland police made one arrest, but it was not directly related to the protest.