Motorola Inc., the world's second-largest cell phone maker, said it's involved in an ongoing investigation conducted by the Securities and Exchange Commission in connection with its business relationship with Adelphia Communications Corp.
The Schaumburg, Ill.-based company disclosed the probe in an SEC filing Thursday.
A Motorola spokesman on Friday wouldn't say whether the company is a target of the probe, and an SEC spokesman also declined to comment.
Motorola recently became embroiled in a $1 billion lawsuit in which Colorado-based Adelphia — once the nation's fifth-largest cable provider — accused it of knowingly assisting some members of Adelphia's founding family in efforts to create "the false appearance of growth in (Adelphia's) cable businesses during 2000 and 2001."
Adelphia's lawsuit, filed in the U.S. Bankruptcy Court in Manhattan, said Motorola created false and misleading documents to help members of the Rigas family carry out and conceal their fraud.
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Adelphia founder John Rigas and his son Timothy were convicted in 2004 of pocketing more than $2 billion from Adelphia for their personal use and misleading investors about the company's finances and performance.
The cable company filed for bankruptcy protection from creditors in 2002.
Motorola spokeswoman Jennifer Weyrauch, in e-mailed responses to questions about the lawsuit Friday, said the company was "unaware of the fraudulent activities being conducted by the principals of Adelphia."

