Indigenous Peoples March
In late afternoon , when the last group of the March participants were still on the Plaza beside the Reflecting Pool , an incident occurred involving a small group of March participants including Omaha tribe member Nathan Phillips , five Black Hebrew Israelites men , and dozens of Covington Catholic High School teenage students on a school trip arriving at their meeting place after attending the pro-life March for Life rally . 
<triplet> Nathan Phillips <subj> Omaha tribe <obj> ethnic group