Thousands of Indorama workers use trucks and vans to set up a blockade on a major road leading out of the Rivers state capital Port Harcourt, June 1, 2007, to protest against the kidnapping of their colleagues. Gunmen used dynamite and heavy machineguns to kidnap at least three senior managers of Indonesian chemical company Indorama in a pre-dawn raid on their residential estate in Nigeria's southern oil-producing delta, police said.