To save time and drilling costs, BP took "shortcuts" that may have led to the oil rig explosion and the spill in the Gulf of Mexico, according to a letter released Monday by two House Democrats leading an investigation of the disaster.

The letter, sent in advance of congressional hearings with senior oil executives this week, paints a damning picture of five decisions the lawmakers said the oil firm took "to speed finishing the well," which was running "significantly behind schedule." Marshaling e-mails, interviews and documents, the lawmakers said: "In effect, it appears that BP repeatedly chose risky procedures in order to reduce costs and save time, and made minimal efforts to contain the added risk."

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