U.S. mortgage applications barely advanced last week even as interest rates sank to their lowest levels since May, an industry group said Wednesday, largely reflecting the increasing difficulty borrowers face to obtain a loan as banks tighten lending standards.

The Mortgage Bankers Association said its seasonally adjusted index of mortgage applications, which includes both purchase and refinance loans, crept fractionally higher, by 0.03 percent, to 656.5 in the week ended Oct. 19 from the previous week's 656.3.