An anti-G8 protester was wrestled to the ground by police officers after appearing to try and jump off a building in central London.
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Thirty-two people have been arrested during the demonstrations in the capital ahead of next week's G8 summit in Northern Ireland.
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Prime Minister Abiy Ahmed called the blast a ‘well-orchestrated attack’.
An explosion at a rally he was speaking at was the narrowest of escapes for Zimbabwean President Emmerson Mnangagwa.
President Emmerson Mnangagwa said ‘it is not my time’ after the blast at a Zanu PF event in Bulawayo.