Oil prices rose for the third consecutive day on Friday, nearing $72 a barrel, as rebel attacks in Nigeria hit output from the OPEC-member country and economic optimism propelled equities markets higher.

U.S. crude rose 49 cents to $71.76 a barrel by 1515 GMT, having topped $72 earlier. London Brent crude gained 45 cents to $71.51 a barrel.

Nigeria’s main militant group MEND said Friday it had attacked a pipeline operated by Italy’s Agip , close on the heels of previous attacks on facilities operated by Royal Dutch Shell and Chevron . Together, the attacks have cut at least 133,000 barrels of daily output.

Rebels in Nigeria, the world’s seventh-largest oil exporter, have been carrying out attacks on the oil industry for years in what they claim is a struggle aimed at spreading the region’s energy wealth to the poor local communities.

Oil prices also got support from political turmoil in Iran, the world’s fifth largest exporter, in the wake of its presidential election.

“We will see support continue to come from Iran and Nigeria. There is no immediate supply threat from Iran but in Nigeria, (there) is an actual physical disruption,” oil analyst Olivier Jakob of Petromatrix said.

Analysts said gains on Wall Street, fed by optimism that the worst of the economic recession was over, encouraged commodity buying by brightening the outlook for demand.

Oil prices have nearly doubled since February on signs of a potential economic recovery but the pace of the rally has sparked concerns prices are not well supported by fundamentals.

Adding to optimism in oil markets, the U.S. Transportation Department said on Friday Americans drove more miles in April than they did a year earlier, marking the first monthly rise in U.S. highway travel in more than a year.

NEW YORK, June 19 (Reuters)