Organizers have postponed the St. Louis Thanksgiving Day parade, citing "unrest in our community."
The annual parade's route includes some blocks where demonstrators caused a halt in traffic during a march Tuesday afternoon,
the St. Louis Dispatch reported.
The group Explore St. Louis made the announcement on its Twitter account Tuesday night, without any details of when the event might be rescheduled.
"Given the unrest in our community following the tragic death of Michael Brown, The Christmas in St. Louis Foundation is postponing the Ameren Missouri Thanksgiving Day Parade until later this holiday season," the Christmas in St. Louis Foundation said in a statement.
"More details will be shared once a new date is confirmed. In these challenging times, we encourage you to gather with your friends and loved ones to reflect, and enjoy this special and unique American tradition."
The decision followed hours after some 350 protesters had blocked portions of an interstate at the end of a march through downtown St. Louis. Four people were arrested suspected of failure to disperse.
Arnita West of Ferguson, Missouri, held up a sign showing the face of Officer Darren Wilson with the words, "Wanted for racist murder." A grand jury Monday declined to indict the Ferguson officer in the Aug. 9 shooting death of unarmed teen Michael Brown.
"I want people to know that the system failed," she told the newspaper.