Federal law enforcement officers have been using unmarked vehicles to drive around downtown Portland and detain protesters since at least July 14. Personal accounts and multiple videos posted online show the officers driving up to people, detaining individuals with no explanation of why they are being arrested, and driving off. The tactic appears to be another escalation in federal force deployed on Portland city streets, as federal officials and President Donald Trump have said they plan to “quell” nightly protests outside the federal courthouse and Multnomah County Justice Center that have lasted for more than six weeks.