Shoppers looking to score some Black Friday deals on the Neiman Marcus website, instead encountered an error message.
"We're currently making improvements to you shopping experience," the message said. "For immediate assistance, simply call 1.888.888.4757."
The luxury brand's homepage has been mostly down since 8 a.m. ET., according to Catchpoint Systems, which monitors retailers' web performance, CNBC reported.
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Ginger Reeder, a spokeswoman for Neiman Marcus, said in a statement, "We are working fervently to get the site back up. I don't have an estimated time it will be back up."
According to Catchpoint Systems, Neiman Marcus' outage was the first significant outage of the day.