WASHINGTON — U.S. home prices rose 12.4 percent in July compared to a year ago, the most since February 2006. An increase in sales on a limited supply of available homes drove the gains.

The Standard & Poor’s/Case-Shiller 20-city home price index reported Tuesday improved from June, when it rose 12.1 percent from a year ago. And all 20 cities posted gains in July from the previous month and compared with a year ago.

Still, the month-over-month price gains shrank in 15 cities in July compared with the previous month, indicating prices may be peaking. And the month-over-month gains in the 20-city price index have slowed for three straight months.

By CHRISTOPHER S. RUGABER – Associated Press

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