Militants in Nigeria blew up an oil supply pipeline on Friday, cutting output by 120,000 barrels a day.
"An oil pipeline was attacked at 11:30 p.m. Thursday night," Brigadier-General Wuyep Rintip told Reuters. "For production to have stopped, this shows the damage was serious."
No injuries were reported in the attack near Chevron's Escravos oil fields.
Rimtip also told AFP that the attack on the Abiteye-Olero crude oil lines could have been carried out by militants using dynamites and rocket propelled grenades. "We have launched a manhunt for the attackers."