Three people were killed and several wounded when an oil pipeline belonging to Italy's ENI exploded in Nigeria's southern Delta region March 27. There have been numerous recent pipeline accidents in the region, where residents have long complained about oil pollution, but the blast at Olugboboro, Bayelsa state, appears to have been an intentional attack. One alleged perpetrator has been arrested, and four others are said to remain at large. Militant attacks are again on the rise in the Niger Delta. In February militants staged a sophisticated underwater attack, probably using divers, on a Shell pipeline, shutting down the 250,000 barrel-a-day Forcados export terminal. President Muhammadu Buhari, elected a year ago, has extended an amnesty signed with the militants in 2009, but has ended pipeline protection contracts to former militant groups. In a period of insurgency a decade ago, groups such as the Odua Peoples Congress (OPC) and Movement for the Actualization of the Sovereign State of Biafra (MASSOB) attacked pipelines and abducted oil workers before Buhari's predecssor Goodluck Jonathan instated the amnesty and began granting contracts to the former militants. There are fears the militants are now returning to arms, and even reviving ambitions to secede from Nigeria. (Reuters, March 30; Reuters, March 29; The Guardian, Nigeria, March 28 via AllAfrica; IBT, July 28)