Witnesses : Comments from police about what caused the explosion were n't immediately available , and there was no immediate claim of responsibility . Blast happened as people attempted to use an elevator outside a hotel in Lagos , Nigeria . There has been no immediate claim of responsibility . Witnesses said the explosion appeared to have come from a plastic bag .
Witnesses : Blast happened as people attempted to use an elevator outside a hotel in Lagos , Nigeria . There has been no immediate claim of responsibility . Witnesses said the explosion appeared to have come from a plastic bag .