Update: BP next step - robot subs slice leaking riser pipe, cap and seal opening, add new riser, capture oil and gas

ROBERT, La. - BP said Saturday that its "top kill" bid to plug the worst oil spill in U.S. history wasn't working and that it would try another approach next.

"We have not been able to stop the flow," BP PLC Chief Operating Officer Doug Suttles told reporters. "We have made the decision to move onto the next option."

"This scares everybody, the fact that we can't make this well stop flowing, the fact that we haven't succeeded so far," Suttles added. "Many of the things we're trying have been done on the surface before, but have never been tried at 5,000 feet."

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