YENAGOA/LAGOS, Nigeria – Nigerian militants threatened on Wednesday to attack off-shore oil facilities within days, raising fears of a repeat of a 2016 wave of violence that helped push Africa’s biggest economy into recession.

The Niger Delta Avengers – the fighters behind many of the 2016 attacks – said they had planned the assaults after giving up on talks to give their impoverished southern region a greater share of the oil revenue it produced.

“This round of attacks will be the most deadly and will be targeting the deep sea operations of the multinationals,” the group said in a statement in its website.

It said its targets, in the seas off the swampland delta region, would include the Bonga Platform and the Agbami, EA and Akpo fields. The militants also said they would target the Nigerian oil company Brittania-U.

Attacks on pipelines and other facilities in the Niger Delta in 2016 cut Nigeria’s crude production from a peak of 2.2 million barrels per day (mbpd) to near 1 mbpd – the lowest level seen in Africa’s top oil producer in at least 30 years.