WASHINGTON — Online retail sales were jumping for "Cyber Monday," the key Web shopping day following the US Thanksgiving holiday weekend, a survey showed.

IBM said its cloud-based digital analytics platform, tracking shopping in real time, showed sales up 26 percent from last year as of 2000 GMT.

"All signs point to Cyber Monday being a banner year," IBM said on its Digital Analytics Benchmark blog.

"The multiscreen shopper is out in full force this year."

The number of consumers using a mobile device to visit a retailer's site was 21 percent, and 11 percent of consumers were using their mobile device to make a purchase, according to IBM.

"Apple continue to be a big winner with the iPhone driving more retail shopping than any other device with traffic reaching 8.3 percent versus 6.7 percent and 5.9 percent for iPad and Android respectively," the blog post said.

The company based its data on "the industry's only cloud-based Web analytics platform that tracks more than a million e-commerce transactions a day."

The hot Monday sales came after surveys showed heavy online spending for Black Friday, the day after Thanksgiving.

Online shoppers spent a record of $1.042 billion on Friday, surpassing last year's Black Friday haul by 26 percent, according to the consulting firm comScore.

A total of 57.3 million Americans visited online retail sites on Black Friday, representing an increase of 18 percent versus a year ago, the firm said.