Backed by $1 billion in capital and a broker sponsor, a new Bermuda-based insurer has been formed to write U.S. property-catastrophe risk.

Known as Ironshore Insurance Ltd. Inc., the venture said it raised more than $1 billion through a private placement of its equity securities and will begin underwriting specialty lines of insurance immediately through its subsidiary, Ironshore Insurance Ltd.

The global specialty insurer was created in response to the crisis conditions in the U.S. property-catastrophe insurance markets, the firm said.

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