ADDIS ABABA, Ethiopia — An explosion struck a huge rally for Ethiopia’s reformist new prime minister on Saturday shortly after he spoke and was waving to the cheering crowd that turned out to support sweeping changes in Africa’s second most populous nation.

Addressing the country minutes after he was rushed to safety, Prime Minister Abiy Ahmed called the blast a “well-orchestrated attack” but one that failed. He did not lay blame but said police were investigating. Health Minister Amir Aman confirmed one death while Abiy’s chief of staff said 83 people were hurt, six critically. Read more