Around 5:30 a.m. Thursday, officers from the Federal Protective Service moved in to remove demonstrators at the Immigration and Customs Enforcement building in Southwest Portland.
Their protest was nearly two weeks old and had forced the closure of the office.
On Tuesday and Wednesday, officers distributed flyers warning the demonstrators they had to clear from the entrance and driveway, but could continue to protest elsewhere on the Federal property.
Officers arrested several people and removed the debris they had set up to block the entrance.
There were no major conflicts with the demonstrators.
Officers closed Macadam Avenue which caused major traffic problems for commuters who had to find other ways to get downtown.