The file photo shows workers at an oil refinery in Port Harcourt, Nigeria

Reports say Nigerian militant group Niger Delta Avengers says it will launch attacks on the country’s oil sector in the next few days.

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

In November, the group, which attacked oil facilities in 2016, said it had ended a ceasefire.