Abuja: Nigerian militants attacked another Shell-operated oil flow station in the Niger Delta on Wednesday, and warned against further attacks on offshore oilfields.

The Movement for the Emancipation of the Niger Delta (Mend) said it attacked the Orubiri flow station in Rivers state.

"Soldiers and oil workers are advised to abandon all oil facilities including the offshore rigs of Bonga and Agbami as we want to minimise casualties," the group said in an e-mailed statement.

Attacks by Mend have cut Nigeria’s oil output by a fifth.