A total of 13 persons were confirmed dead Wednesday from Sunday's attack on the Shell Petroleum Development Company's "Benisede" flow station in Bayelsa State in the Niger Delta, DPA reported. A doctor at a hospital in Warri in the Niger Delta, to where victims of the attack were taken, said she had registered 13 bodies, and that other victims were being treated for serious burns. Ethnic Ijaw youths attacked the flow station with explosives, blowing up two house boats. Shell and its contractors had 42 employees at the facility when the attack took place. Ijaw youths last Wednesday had already attacked Shell's "EA" oil field, also in Bayelsa State, from where they abducted four workers - a Briton, an American, a Bulgarian and a Honduran.