Amazon is to let go of another 9,000 employees worldwide as the e-commerce giant ramps up its cost-cutting measures.The announcement was made to employees of the firm in a note by CEO Andy Jassy, who said workers in the Amazon Web Services, human resources, advertising and Twitch units would be most impacted by the move, with the cuts taking place over a period of weeks.It follows an earlier round of 18,000 layoffs announced in January, as well as the closure of a number of warehouses in the UK and an Amazon Fresh store in London. It is not clear how many UK jobs will be affected as part of the layoffs.