A second, far larger wave of U.S. mortgage defaults is building

The first wave of Americans to default on their home mortgages appears to be cresting, but a second, far larger one is building with alarming speed.

After two years of upward spiraling defaults, the problems with mortgages made to people with weak, or subprime, credit are showing the first, tentative signs of leveling off.

But with the U.S. economy struggling, homeowners with better credit are now falling behind on their payments in growing numbers. The percentage of mortgages in arrears in the category of loans one rung above subprime, so-called alternative-A, or alt-A, mortgages, quadrupled to 12 percent in April from a year earlier. Delinquencies among prime loans, which account for most of the $12 trillion market, doubled to 2.7 percent in that time.

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