The American city of Indianapolis police said that a second person was killed during the violence in the city center, which started on Saturday and extended until Sunday morning.
One person was killed late on Saturday and the second at 2:30 am on Sunday morning, but the city police confirmed that its members were not involved in the killing of either of them.
Police spokesman Michael Hewitt said the cause of these deaths was not immediately clear.
"There is no way to link these deaths, at the present time, to any kind of protests or anything. We do not know whether they are separate incidents or what they are," he added.
The protests turned into violent violence for the second consecutive night in Indianapolis, where the windows of several buildings were shattered.
Individuals also stormed and looted a number of some stores, prompting the police to fire tear gas.
By ... Nadeemy Haded