Baltimore police enforced a curfew for a third night Thursday, as new reports emerged over how the black man at the center of the latest US racial unrest sustained fatal injuries while in police custody.
Fresh protests had broken out in Baltimore and Philadelphia earlier over the death of 25-year-old Freddie Gray - the latest household name in the national debate over whether American police are too quick to use violence against blacks, especially young men.
As a 10:00 pm curfew began in Baltimore, officers formed a cordon and engaged in a brief but mostly non-violent confrontation with a handful of protesters. Afterwards, calm was restored and the streets were largely vacated.
The demonstrations echo protests that erupted in a St Louis suburb last year when a white policeman shot dead an unarmed black teenager, and then flared again in major US cities when a grand jury declined to indict the officer.
Yesterday around 600 people marched in Baltimore, a city of 620,000 an hour's drive from Washington that has witnessed some of its worst unrest in decades.
But there was no immediate return to the scenes that made worldwide headlines on Monday when violence and looting shook the city following Gray's funeral.