BOSTON Two scorching reports released yesterday on the Central Artery/Third Harbor Tunnel project in Massachusetts said the costs of the project could go from current estimates of $7.7 billion to more than $11 billion.

The reports, one from the state auditor's office and one prepared by the Post Audit and Oversight Bureau of the state's House of Representatives, said that contractors have wasted millions of dollars on the project and that the state may have to pick up hundreds of millions of dollars in additional costs.

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