US tech giants delay return to office until Jan.

A surge in coronavirus cases across the United States has prompted some of its biggest tech firms to delay plans to summon their workers back to the office until January next year.

Amazon says that due to the spread of the highly contagious Delta variant, it has abandoned plans to call most of its workforce back to the office on September 7, and now does not expect them on site until January 3.

Amazon has not introduced a vaccination requirement for its staff, but it says anyone without proof of inoculation will be asked to wear a mask.

Facebook says it has pushed back plans for in-person work until January in areas where the Delta variant is spreading. The company said, "Data, not dates, is what drives our approach for returning to the office."

Facebook had initially planned to reopen its offices in October after mandating jabs for all staff working on site.

Apple has also announced that its employees won't be returning to the office until next January.