"A small number of customers have informed us that they have received spam or junk e-mail from an unknown party that apparently used unauthorized and/or illegal means to obtain their e-mail addresses used with Orbitz," spokeswoman Carol Jouzaitis said in a statement. "There is no evidence that customer password or account information has been compromised."

Orbitz found no indication that credit card information had been compromised, Jouzaitis added.

Orbitz became aware of the problem "in the last day or so," Jouzaitis said.

The Chicago-based company has informed the FBI of the information leak and has launched its own internal investigation with a team of security experts, said Jouzaitis.

"We will aggressively pursue all individuals who may have been involved," Jouzaitis said in her statement. She declined to provide any further information on the nature of the breach.

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