 Shortly afta di attack claim of responsibility comot from di Front for di Liberation of di Enclave of Cabinda , wey be separatist group wey never don accept di decision of di former colonial power , Portugal , to integrate Cabinda into Angola in di late 1950s .  O O O B-ORG I-ORG I-ORG I-ORG I-ORG I-ORG I-ORG I-ORG I-ORG O O O B-LOC O O O B-LOC O B-LOC O O B-DATE I-DATE O 