In a statement on its website, the group said it “brought down oil production activities at the Bonny 48 inches crude oil Export Line” through its “strike team”.
Avengers said the attack was a “wake up call” for the government, which it accused of intimidating youths in the region since the ceasefire began.
The statement, however, said the group was “still in favour of dialogue and negotiations”.
This would be the first attack in Nigeria’s southern energy hub since Niger Delta Avengers declared in August that it was halting hostilities to pursue talks with the government.
It comes as part of a chain of attack on oil installations by militant groups in Nigeria’s south-south region, which has drastically affected the nation’s economy.
The Niger Delta Avengers have claimed responsibility for most of the attacks on the oil facilities.