The army said militants killed six people on Wednesday when they ambushed a boat belonging to state oil firm Nigerian National Petroleum Corporation (NNPC)in the Warri area.
Separately, the Niger Delta Avengers group said it had attacked two crude pipelines operated by Italy's Eni.
"At about 2:00am today @NDAvengers blew up the Ogboinbiri-to-Tebidaba and Clough Creek-to-Tebidaba crude oil pipelines in Bayelsa State," the group said on Twitter.
"This
