Attorney General Eric Holder visited Ferguson, Missouri, to help ease tensions after the shooting death of 18-year-old Michael Brown.
Last night's protests were more peaceful.
Holder met with protestors and law enforcement officials and promised a thorough investigation.
A grand jury is now reviewing evidence in the shooting death of Brown.
Many in Ferguson want Officer Darren Wilson, who shot and killed the unarmed man, arrested. But it could take months to decide whether Wilson will face criminal charges.