Purchases of new U.S. homes plunged in July by the most in more than three years and previous months were revised down, a sign that growth in the industry may be taking a pause as mortgage rates rise.

Sales of newly built homes declined 13.4 percent to a 394,000 annualized pace, the weakest since October, following a 455,000 rate in the prior period that was lower than previously estimated, Commerce Department figures showed Friday in Washington. The median estimate of 74 economists surveyed by Bloomberg called for a decrease to 487,000. Last month's decline was the biggest since May 2010.