BBC news reported Saturday that militants in Nigeria have again sabotaged oil transfer infrastructure belonging to Royal Dutch Shell (NYSE: RDS A). This is the fifth incident of such attacks in recent weeks. The BBC report states: "Several previous ones have been blamed on supporters of the militant leader Henry Okah, who is currently awaiting trial on treason charges."

A Shell Oil spokesperson is quoted as stating that multiple oil delivery lines are affected and that some amount of oil has spilled into the environment. The company is undertaking oil containment measures and production volume has been reduced. Reuters News Service reported: "...the rebel Movement for the Emancipation of the Niger Delta (MEND) ... has already knocked 164,000 barrels a day off Shell's production in Nigeria with a pipeline bombing last month."

According to Reuters, local security forces are reporting that not just oil delivery lines have been affected. They claim that three oil wells and other equipment were also subjected to damage. Additionally, this news of sabotage comes on the heels of an eight day Nigerian labor strike against Exxon Mobil Corp. (NYSE: XOM). That strike ended this past Thursday and had temporarily cut that company's Nigerian oil production in half. And of course, with oil supply problems and concerns, oil prices have increased.