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WASHINGTON (AP) _ Accounting firm Arthur Andersen LLP said Tuesday it is firing the lead auditor of collapsed Enron Corp. and is putting three other auditors on leave as part of its inquiry into the destruction of Enron-related documents.

Andersen said it also is replacing the management of its office in Houston, where Enron is based. Four Andersen partners in the Houston office ``have been relieved of their management responsibilities,'' the accounting firm said.

The firm said it will fire any other employees found to have participated in the improper destruction of documents.