US experts sent by AngloDutch oil firm Shell to halt a spill in Nigeria&#039s Ogoniland were taken hostage by Ogoniland residents, but were later released, a company spokesman said yesterday. The three experts from Houstonbased Boots and Coots International Well Control arrived in the country last week to control the spill at Shell&#039s Yorla oil field in southern oilrich Ogoniland. Full Story