HARTFORD, Conn. - Aetna Inc. is reviewing a $10.5 billion buyout offer from ING Barings and Wellpoint Health Networks.Aetna shares surged 29% as word that the two suitors had offered $70 a share, spread Wednesday. It acknowledged after a pair of trading halts that it had gotten a letter from Wellpoint and ING on Feb. 24.

Discussions reportedly centered on a deal in which ING would take the financial services unit and Wellpoint the health-care business.

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