Abuja - Nigerian Acting President Goodluck Jonathan Tuesday ordered the implementation of an amnesty deal for ex-rebels to be sped up, his spokesman said a day after deadly blasts in the restive Niger Delta.

"Today, the acting president gave marching orders to all agencies, bodies and individuals involved in amnesty to immediately go to work," Ima Niboro told journalists.

All people involved should "ensure that whatever challenges are holding up these areas (programmes) are surmounted very quickly so that the process can move ahead flawlessly," he said.

The order came a day after blasts in southern oil city of Warri, triggered by the nation's main armed militant group, killed at least one person and injured several others.

The Movement for the Emancipation of the Niger Delta (MEND) claimed responsibility for two explosions that rocked the Warri venue of amnesty talks for former rebel fighters.

In January MEND called off a unilateral truce it announced in October following a government amnesty for former rebels in the "oil war" zone, lamenting a lack of progress on rehabilitating and retraining former fighters.

The region has been rocked by more than three years of fighting by armed militants demanding a greater share of oil wealth for local communities.