Insurance adjusters seeking to survey the damage in statesdevastated by Hurricane Katrina were kept at bay by flood watersand blocked roads in many areas today, insurers said.

Meanwhile, the Boston-based AIR Worldwide catastrophe modelingfirm refined its estimate of Katrina's damage and said the stormcould cost the insurance industry between $17 billion and $25billion. Yesterday, the company put the number at from $12 billionto $26 billion.

At $25 billion, Katrina would be the most costly naturalcatastrophe in U.S. history, surpassing the $15.5 billion ofinsured losses from Hurricane Andrew in 1992, which would be $20billion in today's dollars.

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