Nigerian gunmen attack tanker, top rebel freed

By Tume Ahemba and Shuaibu Mohammed

LAGOS/JOS, Nigeria (Reuters) - Nigeria's main militant group widened its offensive against Africa's biggest oil sector on Monday despite the release of its suspected leader.

The Movement for the Emancipation of the Niger Delta (MEND) sabotaged an oil tanker unloading in Lagos state, killing five people in the group's first attack outside the Niger Delta since it began its latest campaign of violence.

The expansion of MEND's range has heightened security concerns beyond the oil industry and dashed hopes that the release of its suspected leader, Henry Okah, would halt the militant offensive, analysts said.

"What the government has done in the case of Okah is like treating the symptom and not curing the disease," said Abubakar Momoh from Lagos State University.

"That will not put an end to militancy because there are many Henry Okahs there, except that they are not as well known."

MEND said its fighters set unloading tankers and the depot ablaze overnight at the Atlas Cove Jetty in Lagos, a key port where ships unload imported gasoline, diesel and other products.

"We were taken by surprise because the facility is well secured," Mohammed Barkindo, managing director of state-run oil firm NNPC, told reporters at the damaged dock. "This is the first time this type of incident has happened."

BOLDER ATTACKS

MEND has rarely attacked sites outside the Niger Delta, focussing mainly on oil facilities in Delta, Bayelsa and Rivers states in southern Nigeria.

"They are obviously getting much bolder," said a private security source working for the oil industry. "We are on the lookout for more attacks. They could happen anywhere now."

Analysts say the militant group may be trying to strengthen its position before possible talks with the government.

MEND, which is in the process of forming a negotiating team, said it would use a "two-pronged approach of combining dialogue and intensifying attacks throughout the course of negotiations."

The violence has already forced Royal Dutch Shell (RDSa.L), U.S. oil company Chevron (CVX.N) and Italy's Agip (ENI.MI) to shut down around 300,000 barrels per day of production in the last seven weeks, lifting global oil prices.

HENRY OKAH

The government met one of MEND's key demands by freeing Okah after more than a year in detention for suspected arms dealing.