The police chief said protesters assaulted police with bricks and bottles, and officers responded by using tear gas and firing pepper-spray balls. More than 20 people had been arrested, and 10 police officers had suffered injuries including a broken jaw and a dislocated shoulder.
Hurricane Irma was expected to grind its way along the western coast of Florida.
The National Hurricane Center upgraded Irma to a Category 4 storm early Sunday morning, with predicted landfall in the Florida Keys at daybreak.
Tales of looting and gun-toting criminals in Houston have spread on social media in the aftermath of Hurricane Harvey, often false.
As of Tuesday evening, officials believed that at least 22 people across Texas are dead of storm-related causes.
As much of Southeast Texas remains underwater, reporters for The Washington Post are fanned across the region.
Some parts in the Houston metropolitan area could receive an unprecedented 50 inches of rain, officials say.
Missouri Gov. Eric Greitens asked a board to review claims that new DNA evidence exonerates Williams, who was sentenced to death in 2001.
Police say 27 people were arrested, most for disorderly conduct.
