Militants in southern Nigeria say they had no role in the bomb that killed at least four people in the capital, Abuja, on New Year's eve.
The Movement for the Emancipation of the Niger Delta, or MEND, denied any involvement in the attack, in a statement e-mailed to reporters late Saturday.
MEND had claimed responsibility for another bombing in Abuja October 1 that killed 12 people.
Friday's bombing in the capital went off at a busy market where people were celebrating the new year. No one has claimed responsibility for the blast, which wounded another 26 people.