Los Angeles port officials admitted Tuesday they erred by failing to inform elected officials earlier about skyrocketing costs on a major container terminal upgrade.

The cost of the planned 173-acre TraPac terminal upgrade at the Port of Los Angeles has more than doubled over the past four years. The project was approved in 2009 at a cost of $245 million, but is now estimated at $510.4 million, according to a report by Harbor Department officials.

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