Nigerian militants who sabotaged oil facilities and kidnapped workers in the southern Niger Delta threatened yesterday to stage more attacks over the next few days in the world's eighth-largest exporter...Royal Dutch Shell evacuated about 330 workers from four oil flow stations after the latest attack on Sunday...The militants demand local control of the Niger Delta's oil wealth, that Shell pay the local government $1.5 billion to compensate for pollution, and the release of three men, including two ethnic Ijaw leaders...