The Pentagon has begun polygraph testing of employees in an attempt to find out who leaked information to Chalabi about Iran.

The polygraph examinations, which are being conducted by the Federal Bureau of Investigation, are focused initially on a small number of Pentagon employees who had access to the information that was compromised. American intelligence officials have said that Mr. Chalabi informed Iran that the United States had broken the secret codes used by Iranian intelligence to transmit confidential messages to posts around the world.

Chalabi, through his lawyers, has denied that he leaked info to Iran.

They sent a letter to Attorney General John Ashcroft and F.B.I. Director Robert S. Mueller III repeating Mr. Chalabi's denials and demanding that the Justice Department investigate the disclosure of the accusations against Mr. Chalabi.