About 100 people were at the protest, authorities said.
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Michigan State Police are doing an accident reconstruction WEYI reported.
The truck’s driver is cooperating with police, but is not in custody.
Witnesses said that people were crossing the street when the crash happened, according to the television station.
People gather to tend to a protester lying on the ground after a truck collided with into protesters calling for the right to form unions Tuesday, Oct. 2, 2018, in Flint, Mich. Police said the collision appears to be an accident.