Dayton had two days of demonstrations Saturday and Sunday, and is among at least 40 cities that have imposed curfews.
Protests on Saturday turned into clashes with police, with some people throwing bottles at officers, damaging police cruisers and businesses in downtown Dayton.
Nearly 40 people were arrested over the weekend; the majority were residents of Dayton.
PHOTOS: Damage in the aftermath of Saturday protests in Dayton
However, others showed support for the businesses that were damaged.
Protesters returned Sunday.
PHOTOS: Protesters march through Dayton for second day of demonstrations
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