Ferguson became a flashpoint for often troubled U.S. race relations after officer Darren Wilson shot dead Michael Brown on Aug. 9.
The Ferguson area, and the Canfield Green Apartments near where Michael Brown was killed, has been struggling to return to normal since.
The U.S. Justice Department is probing possible civil rights abuses, and President Barack Obama has called for reflection on the difficulties minorities face in the country.
The grand jury’s decision on Monday not to charge Wilson prompted a spasm of fury in Ferguson. About a dozen businesses were torched and more than 100 people were arrested in clashes with riot police that rumbled on into Tuesday night.
But Wednesday and Thursday were far quieter, with no major incidents reported.