A curfew will be put in place starting at midnight and run until 5 a.m. local time, according to Highway Patrol Captain Ron Johnson, who the governor appointed to oversee security in the suburban St. Louis community that has been roiled by the August 9 shooting of 18-year-old Michael Brown.
Captain Johnson said that answers would be given to everyone as violence spilled over over the the past week.
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It is unclear what their alleged plans were.
Anti-terror police are currently questioning the men who were arrested at three separate locations in France.
A weather warning is also in place for Scotland, which could see "treacherous" and blizzard-like conditions on Thursday.