An explosion on Saturday killed several people at a huge rally by supporters of Ethiopia's new, reformist Prime Minister Abiy Ahmed in the capital, Addis Ababa.
"A few people" were killed in a "well-orchestrated attack", Al Jazeera quoted Abiy, as saying in a televised address shortly after Saturday's blast.
The explosion is said to have occurred shortly after Abiy ended addressing the crowd in Addis Ababa's Meskel Square and was waving to the crowd, as per several media reports.
The Ethiopian prime minister offered his condolences to the families of the victims.
An investigation into the incident was underway.
Footage showed Abiy being swiftly whisked away from the site by security guards.
Ambulances were also present at the scene.
Abiy became prime minister after his predecessor Hailemariam Desalegn unexpectedly resigned in February.
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