UPDATE: BestBuy.com issued a short two-sentence explanation about 11:30 a.m. EST on why its website site crashed on Black Friday, one of the busiest online holiday shopping days of the year:

"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. Our consumers can return to BestBuy.com in the next several hours to take advantage of today's door busters."

ORIGINAL STORY

The worst nightmare for any e-retailer on Black Friday is a site crash and BestBuy.com, as of 10:30 a.m. EST, was living that nightmare.

The site offered a short and succinct note to shoppers trying to access the website; “We’re Sorry. BestBuy.com is currently unavailable. Check back soon.”

Black Friday is notorious for luring in new customers as it's the biggest deal day of the year, especially for electronics. This year, however, brought a major strategy shift by both offline and online retailers striving to capitalize on the biggest consumer shopping weeks of the year. Many stores initiated 'Black Friday' sales on Thanksgiving, opening doors at 6 p.m. to offer Black Friday specials. Other retailers are expanding 'Black Friday' sales beyond Friday in hopes of boosting revenue streams.

As of 11 a.m. the BestBuy.com site was still shuttered.

Tech Times will update the story as more information becomes available.