Two people were killed and eight others wounded after a grenade exploded last night against a government building in Bwiza, outside Bujumbura. A week after similar episodes that wounded seven others, tensions in the capital of Burundi are rising in view of the June 28 presidential election. Local websites report that the victims from today's bomb are the owner of the pub 'Chez Obama' and one of the waiters. A witness said that immediately after the explosion he saw two people quickly getting away on a motorcycle. There was another explosion in the suburbs of Bujumbura but there are no reports of victims. Last month, 13 opposition parties had rejected the results of the recent municipal elections, won by the government party Cndd-Fdd with 64% of the vote. Having emerged from 13 years of civil war (1993-2006) - which left 300,000 people dead and destroyed the national economy - the country is facing a long electoral marathon, launched on May 24 to conclude in September with local elections, considered to be crucial for the consolidation of democracy.