The Niger Delta Avengers militant group issued a two-week ultimatum to oil companies operating in Nigeria’s oil rich Niger Delta region, warning companies to shut down or risk attack, the Nigerian publication This Day reported May 12. The group has claimed responsibility for several attacks on oil pipelines and platforms , including an explosion that targeted a Chevron oil platform on May 4. While the militant group has shown it can conduct assaults against individual installations, it has not yet demonstrated the ability to disrupt regional oil production on a larger scale.