Blast hits Chevron oil facility in Nigeria's Delta -security source

By Tife Owolabi YENAGOA, Nigeria (Reuters) - An explosion rocked a Chevron oil pipeline in Nigeria's restive Delta region on Friday, a security source said, the second blast at a facility of the U.S. oil major within a week, feeding concern over a revived militant campaign in the area. The swamps of the southern Delta have been hit by a series of militant attacks on pipelines and other oil and gas facilities that have reduced Nigeria's output by 300,000 barrels a day and closed a major export po