Specialty clothing retailer Gap Inc has seen its same-store sales fall by 5% in July, in what it describes as a "challenging" month in which declines were booked in all divisions.

Net sales for the four weeks to 30 July edged up a marginal 0.1% to $949m, up from $948m in the same period last year.

"While July proved to be challenging, we're pleased that we grew net sales for the quarter and that we're able to guide earnings per share above analyst expectations," said Glenn Murphy, chairman and chief executive officer of Gap Inc.

By division, comparable sales slipped 6% at Gap North America, fell 4% at Banana Republic North America, dropped 3% at Old Navy North America, and tumbled 10% at its international unit.

For the second quarter, the results mean net sales have risen 2% to $3.39bn from $3.32bn, but same-store sales, including online sales, were down 2%. Earnings per share are expected to be in the range of $0.33 to $0.34.