oil spill, said at a press conference in Washington that BP removed the containment cap because an underwater remote- operated vehicle (ROV) collided with it.

The ROV accidentally closed a vent on the cap, disrupting the system that funnels oil to the drillship Discoverer Enterprise, said Allen, adding that the closed vent forced gas into lines used to heat the system to prevent slush-like gas hydrates from plugging the cap.

However, Allen said, oil is not spilling "unconstrained" because it continues to flow to the Gulf surface through a second containment system.

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