However, Amazon Spain said the figures did not reflect reality and a majority of employees were processing orders.
Some of Amazon's workers in Europe are protesting against what they call unfair work conditions, in a move meant to disrupt operations on Black Friday.
The strike of Amazon workers reportedly raised with the issue that managers had to step in and pack boxes in order to meet the demand.
In a press release sent to Business Insider, the GMB said it was protesting "inhuman conditions" at the warehouses. "They are breaking bones, being knocked unconscious and being taken away in ambulances", general secretary of the GMB union Tim Roache said in a statement. "These are people making Amazon its money".
According to the unions, between 85 and 90 percent of staff at the company's warehouse have joined in the strike.
"Working people and the communities Amazon operates in deserve better than this".
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Dayna Less, a pharmacist, had recently graduated from Purdue University and was in her first year of residency at Mercy Hospital. Lopez and O'Neal had set a wedding date of October 27, according to the former couple's gift registry at Bed, Bath & Beyond.
"These are days when we can hurt more and make ourselves be heard because the company has not listened to us", said Eduardo Hernandez, in an interview with the AP.
"Your employees need better conditions and better recognition", Watson said.
Amazon warehouse workers in Germany and Spain are planning to strike for at least, Reuters reports.
Barely two days back reports had emerged that Amazon had mistakenly leaked the names and email addresses of thousands of customers due to technical error. "Amazon has invested over 27 billion euros ($30.6 billion) and created over 75,000 permanent jobs across Europe since 2010".
A security guard stands next to a truck behind a gate outside the main Amazon Logistics Center where goods are stored for distribution, on the outskirts of Madrid, Spain, Friday Nov. 22, 2018.
"We encourage everyone to compare our pay, benefits, and working conditions to others and come to see for yourself on one of the public tours we offer every day at our centers across the UK", the statement reads.
"According to the UK Government's Health and Safety Executive, Amazon has over 40% fewer injuries on average than other transportation and warehousing companies in the UK".