The Niger Delta Avengers militant group has claimed responsibility for an attack on an oil pipeline operated by a Nigerian subsidiary of Italy’s Eni oil company, Agip, The Wall Street Journal reported. The pipeline is related to the Brass River crude oil stream in Nigeria’s Bayelsa state, the site of many attacks over the past month.

“There was an attack on the Obi Obi Brass Pipeline between 1 and 2 am today Friday,” said Desmond Agu, commander of the Nigeria Security and Civil Defense Corps in Bayelsa state, according to Reuters. Agu added: “There is an oil spill at the scene, but the place is not on fire.”

There was no immediate indication that flows from Brass River had completely stopped, however, Eni’s Agip’s Brass River oil stream is already under force majeure.

The attack is one of several in recent weeks by militants in the region who are targeting Nigeria’s oil infrastructure as they accuse the government of stealing the resources in the Niger Delta region.

Earlier this month, ENI announced that the firm’s production had been cut short by 65,000b/d following an attack on its pipeline in Bayelsa that took place on June 3rd by the same group.

Later on, the Niger Delta Avengers had further rejected invitation to truce talks with the government.