WASHINGTON — Federal banking regulators on Wednesday were unable to say when they might finalize rules under the international Basel III accord that would require banks to increase the capital backing their assets and change the way they determine the riskiness of their investments and loans.

The Securities Industry and Financial Markets Association and other market participants have sent some 1,500 letters to the regulators warning that rules they proposed in June, which were to take effect on Jan. 1, would hurt the municipal and other financial markets as well as banks.

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