ING Group's joint bid with WellPoint Health Networks Inc. to buy Aetna Inc. may be just the start of a buying spree by the Dutch financial group in both the United States and Europe, analysts said.

ING has made no secret of its intent to buy a significant share of the U.S. insurance market. Its goal, analysts said, is to acquire its way into the top 10 in U.S. life insurance. Analysts predicted that the $383 billion-asset Amsterdam-based group could follow with bids for a handful of U.S. insurers - even on top of buying Aetna.

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