A grenade attack during rush hour in the Rwandan capital of Kigali wounded at least seven people only hours after the official results of the presidential poll were announced.
Two children were among the injured in the blast which analysts claim appeared to be aimed at producing a political crisis.
As expected the incumbent, Paul Kagame won with 93 per cent of the votes, but critics said the election was marred by government repression.
The election outcome had been expected as three would-be opposition candidates had been prevented from standing while those who did had close links with Kagame’s own party.
However the president is widely lauded for re building Rwanda and establishing peace in the aftermath of the 1994 genocide.