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Claims have emerged from two terrorist groups the blast was the result of insurgents in the US. A formerly unknown group calling itself the al-Quaida Organisation for Holy War in the United States of America said it would be issuing a detailed statement and video of the explosion.
Another claim came from the Army of Levant group which also said it was responsible for the blast.
It was the third fatal accident at the plant in the last 12 months.
A BP spokesman said FBI agents had been sent to the plant but ruled out there had been a terrorist attack or other criminal activity. It could not pinpoint the cause of the blast however.
