Yahoo! Inc., the second-most-popular search engine, has accused unidentified companies of trying to trick Internet users into providing credit-card information and other personal data.

The company, based in Sunnyvale, Calif., filed a lawsuit in Manhattan federal court this month against at least 25 companies, accusing them of deceiving Internet users into believing they won a lottery or prize offered by Yahoo.

"This type of lottery scam is a hoax designed to trick unsuspecting e-mail users into revealing valuable personal data like passwords, credit card information, and social security numbers," Yahoo said in a statement Tuesday.

Yahoo delayed its annual meeting last week after billionaire Carl Icahn threatened to oust its directors for snubbing a $47.5 billion takeover offer from Microsoft Corp. The meeting, originally set for July 3, will now occur at the end of July.