<p>At least 15 people were burnt alive or shot dead in a horrific attack in central Burundi after armed men blocked off a road and started killing travellers, security sources said Sunday.</p>.<p>The ambush on Saturday night took place in Muramvya province, mirroring similar attacks staged here last year.</p>.<p>Armed men barricaded a road with boulders and sprayed bullets on vehicles. They also poured petrol and set alight two buses, burning the passengers alive in what one witness said were "scenes of horror".</p>.<p>At least 13 people were torched alive and between two and five-shot dead, witnesses and a local official said.</p>.<p>A local official said 15 others were wounded, of whom six had serious injuries.</p>.<p>A security source told AFP on condition of anonymity that the toll was 17 as the "heavily-armed" attackers shot dead two others while fleeing.</p>.<p>The source said at least four people had been arrested.</p>.<p>The interior ministry confirmed the 8:00 pm attack near the Munanira hill but did not provide a toll.</p>.<p>In early May, a similar ambush in the same area claimed at least 12 lives.</p>.<p>Civil society groups in exile blame such attacks on ethnic rivalry and infighting in the former Hutu rebel group Cndd-FDD, which is now in power.</p>
<p>At least 15 people were burnt alive or shot dead in a horrific attack in central Burundi after armed men blocked off a road and started killing travellers, security sources said Sunday.</p>.<p>The ambush on Saturday night took place in Muramvya province, mirroring similar attacks staged here last year.</p>.<p>Armed men barricaded a road with boulders and sprayed bullets on vehicles. They also poured petrol and set alight two buses, burning the passengers alive in what one witness said were "scenes of horror".</p>.<p>At least 13 people were torched alive and between two and five-shot dead, witnesses and a local official said.</p>.<p>A local official said 15 others were wounded, of whom six had serious injuries.</p>.<p>A security source told AFP on condition of anonymity that the toll was 17 as the "heavily-armed" attackers shot dead two others while fleeing.</p>.<p>The source said at least four people had been arrested.</p>.<p>The interior ministry confirmed the 8:00 pm attack near the Munanira hill but did not provide a toll.</p>.<p>In early May, a similar ambush in the same area claimed at least 12 lives.</p>.<p>Civil society groups in exile blame such attacks on ethnic rivalry and infighting in the former Hutu rebel group Cndd-FDD, which is now in power.</p>