Nairobi blast was terror attack, claims Odinga Kenya under attack? Of course the kuffar (unbelievers) has attacked Somalia!" read another Twitter message from the Kenyan-based Muslim Youth Centre, a group linked to the Shebab, according to United Nations reports. The blast was powerful enough to rip the tin roof off the building and smash windows across the street. Wounded were carried from the explosion in a commercial building housing several small shops. Many appeared to have cuts from broken glass or flying debris. Police Commissioner Mathew Iteere had earlier said the explosion was not a grenade or bomb attack, and that "preliminary conclusions" suggested it was an electrical fault. A large plume of black smoke rose high into the air as ambulances rushed the wounded to hospital, but fire fighting trucks with sirens blaring extinguished the blaze soon after. "I addressed parliament and warned of such acts... we chased them from here now they are trying to come back," Odinga added. We'll remain united. Our security forces need to be strengthened," he added.