Three members of Burundi's ruling party youth league, described as a militia by some, has died when a grenade exploded in the capital Bujumbura, police and witnesses said Thursday.
The "Imbonerakure" -- whose name means "The Watchmen" -- has long been accused of using barbaric methods to achieve political ends on behalf of President Pierre Nkurunziza and his ruling CNDD-FDD party.
The explosion happened last evening in a house in the Musaga district of Bujumbura which residents said serves as a neighbourhood headquarters for the youth wing.
Municipal police commissioner, Bonfort Ndoreraho, confirmed that the victims were members of the Imbonerakure and said the perpetrator was "not yet known".
However, another police source told AFP that it was unclear whether the deadly blast was the result of "an external attack or an accident."
Rights groups have detailed abuses by Imbonerakure members accusing them of intimidation, torture, rape and murder of government opponents.
Burundi's sometimes violent political crisis has caused 400,000 to leave the country and left hundreds dead since 2015.
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