"We wanted people to see who we are, what we are," Dick Leitsch told NBC News in 2017.
Video from the scene showed bloodstained ground and abandoned shoes while people chanting the prime minister's name fled.
Martin Luther King Jr. cried when he visited Marks, Mississippi, in 1968. If he were alive today, "he may very well still be weeping," one official says.
Arrington suffered a fracture in her back, several broken ribs and she will have major surgery to remove portions of her small intestine and colon.
The vice president suffered minor injuries in the blast but President Emmerson Mnangagwa was left unhurt, a source close to Mnangagwa told Reuters.