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New York -- Michael Dell may face competition over his bid to take the computer maker he founded private in a $24.4 billion deal.

The Wall Street Journal is reporting that buyout specialist Blackstone Group and activist investor Carl Icahn have both notified a special committee of Dell Inc.'s board that they are working on bids for the company.

Michael Dell and a group of investors announced their bid, valued at $13.65 per share, in early February. The company's board then set a 45-day period to allow for offers that might top that bid. That period expired Friday. The Journal says the notification will allow Blackstone and Icahn time to develop their offers.

Icahn and others have criticized the Michael Dell bid as being too low.

A Dell representative declined comment.