The Port Authority of New York and New Jersey last week expanded its credit support to bonds expected to be sold for the development of a tower at the World Trade Center site due to rating concerns.

The authority modified its credit s­upport agreement to incorporate contingencies in case of bankruptcy by the subsidiary of developer Silverstein ­Properties Inc. that is responsible for making debt-service payments on $1.37 billion of tax-exempt Liberty bonds, which are to be used to partially finance Tower 4.

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