MINNEAPOLIS — A surge in mobile traffic during the height of Black Friday shopping led Best Buy to shut down its website for more than an hour Friday morning, the Richfield-based electronics retailer said.

“A concentrated spike in mobile traffic triggered issues that led us to shut down BestBuy.com in order to take proactive measures to restore full performance,” the company said in a statement. “Our consumers can return to BestBuy.com in the next several hours to take advantage of today’s door busters.”

By about 10:20 a.m., the website appeared to be back online.

When shoppers went to the website earlier in the day, they were greeted by a message that said, “We’re sorry. BestBuy.com is currently unavailable. Check back soon.”

Meanwhile, Minneapolis-based Target reported this morning that online sales on Thanksgiving hit an all-time high for the retailer, up 40 percent on that day from the year before. Many retailers, including Target and Best Buy, made many of their Black Friday deals available online on Thursday morning, many hours before stores opened later that night.

Some of Target’s top-selling items online were the iPad Air 2, the Nikon L330 camera, Beats by Dre Solo HD headphones, and a Sony PlayStation 4 bundle.