The Movement for the Emancipation of the Niger Delta (MEND), responsible for attacks that have cut a fifth of OPEC member Nigeria's oil output, said it would launch attacks outside Rivers state for the first time since clashes began on Saturday.
The heaviest fighting between militants and security forces in more than two years has spread to about 10 villages, but has remained in Rivers state, home to oil city Port Harcourt.
"After Rivers, the hurricane will be heading to the neighbouring states in the Niger Delta," the group said in an emailed statement.
Some security forces in the oil industry estimate more than 100 people may have been killed in recent clashes.
Militants have bombed pipelines, platforms, gas plants and oilfields, halting up to 115,000 barrels per day of oil production in the last five days, government officials said.
Nigeria's oil is popular in the United States and Europe because it is easily refined into gasoline, diesel and other crude products.
Oil traders on Wednesday began taking notice of Nigeria's escalating violence, pushing prices above $94 a barrel in early trading. The market has fallen sharply this week on the impact of the credit crisis on the global economy.
MEND, which says it is fighting for more local control of the impoverished region's oil wealth, attacked Shell's Orubiri flow station on Tuesday with help from the Niger Delta Volunteer Force, another militant group in the region.
"It is feared the facility may have caught fire due to intense, sporadic gunshots and massive dynamite and bomb explosions," said Lieutenant Colonel Sagir Musa, spokesman for the military task force in Rivers state.
Musa said no soldiers were killed in the attack, which involved an assault by eight militant gunboats.
Militants said their next targets would be major offshore oilfields.
"Soldiers and oil workers are advised to abandon all oil facilities including the offshore rigs of Bonga and Agbami as we want to minimise casualties," MEND said.
MEND launched its most daring strike in June against Shell's $3.6 billion Bonga oilfield, which lies some 120 km from the coast, forcing the company to shut down the 220,000 bpd operation for several days.
MEND's other target, Chevron's Agbami oilfield, is Nigeria's newest oilfield. The facility, which started production in late July, is expected to pump about 100,000 bpd by February.—
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