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If approved, the loan would take the total amount committed by the lender to the initiative past the US$1bn mark, the Wall Street Journal reported IDB bank president Luis Alberto Moreno as saying.
The announcement comes after two multimillion-dollar loan packages were authorized. Last week the IDB committed to providing US$750mn in loans for the metro line and Caracas-based lender CAF approved US$150mn in financing.
Lima metro, which has already awarded studies for a third line, is Latin America's largest infrastructure project, Peruvian President Ollanta Humala has said previously.