LinkedIn Corp., owner of the world's biggestprofessional-networking website, said that it's looking intounconfirmed reports of stolen passwords.

“Our team continues to investigate, but at this time, we'restill unable to confirm that any security breach has occurred,” theMountain View, California-based company said on its Twitter Inc.micro-blogging site.

LinkedIn sent its first tweet this morning telling users that itwas looking into the issue and followed up at about 11:20 a.m., NewYork time, saying nothing was confirmed. A spokeswoman, ErinO'Harra, said LinkedIn will continue to update users onTwitter.

The company cites security issues as a risk for investors inregulatory filings. In a quarterly report to the U.S. Securitiesand Exchange Commission last month, LinkedIn said it hasexperienced website disruptions and outages for reasons that haveincluded “denial of service or fraud or security attacks.” Futuredisruptions were possible, according to the filing.

While the company didn't mention any specific attacks, Reutersreported in May 2011 that the website had “security flaws” thatmade accounts vulnerable to hackers, citing a security researcherwho identified the problem.

LinkedIn fell 1.4 percent to $91.74 at 12:20 p.m. in New York.The stock has more than doubled since the company's initial publicoffering in May 2011.

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