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Over the course of the investigation, 51 suspects were arrested, including 38 in Australia, 11 in Ireland, one in Canada and one in Italy belonging to the Italian Sacra Corona Unita mafia group.

President João Lourenço established a commission to investigate acts of political violence since independence in 1975, including the events of 1977 and the 27-year war with Unita rebels which ended in 2002.

Mr. Bout, immortalized by Hollywood in the film “Lord of War,” was convicted in 2011 of conspiracy to kill U.S. citizens and officials with his indiscriminate arms sales, which armed both anti-American terrorist organizations and pro-American insurgents like Angola’s UNITA.

UNITA's leader Adalberto Costa Junior had called for the protests after losing to incumbent President Joao Lourenco in the August 24th elections.

Across the country, in the northern city of Modena, plates of the local speciality, tortellini - pasta stuffed with meat - are being served up at the Festa de l'Unità, the annual festival of the centre-left.