Thousands of workers in Amazon sites around the world are staging protests about pay and conditions as the online retailer begins its annual sale.
Amazon is on Monday offering discounts to its Prime service members.
Unions say that 2,000 workers are on strike in Germany, while in the US, workers in a Minnesota centre have reportedly planned a six-hour stoppage.
In the UK, week-long protests are planned.
Amazon has said it offers great employment opportunities.