A truck has exploded in a huge fireball, killing at least 17 people in the northeast Nigerian city of Maiduguri, the latest attack in a city repeatedly hit by Boko Haram fighters. Tuesday's bomb rocked Maiduguri's largest roundabout near the crowded Market where elderly women line the road selling peanuts and kola nuts as snacks to morning commuters. The Defence Ministry said in a tweet that an ’improvised explosive device’ went off in ‘a van loaded with charcoal’ and that the area had been cordoned off. One witness said the bomb went off just after the market opened at 8am before most traders or customers had arrived. Unruly crowds tried to attack fire-fighters deployed to the scene, accusing them of arriving too slowly and hindering their efforts to put out the raging blaze, the AFP news agency reported.