Even as BP finished construction on one massive containment dome Monday and started drilling a relief well to cope with the oil leaking from crumpled pipes at the bottom of the Gulf of Mexico, lawmakers and Gulf Coast residents began questioning whether the company will take full responsibility for the economic losses stemming from the spill.

The incremental steps forward -- the company finished one four-story, 74-ton dome and hopes to complete two others on Tuesday -- came as company and Obama administration officials predicted it might take up to three months to seal off the spill threatening the Gulf Coast's sensitive ecosystem.

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