A trade union on Sunday called on workers at a German Amazon warehouse to strike for the second time in a week to disrupt the processing of orders following the ‘Black Friday’ discount shopping sales on Nov. 27, Reuters reports.

Some 500 workers took part in a three-day strike that started Thursday and ended Saturday, according to trade union Verdi, with the next strike set to begin Monday night and end Tuesday night. Germany is Amazon’s second-biggest market after the US.

The U.S. retail giant has seen sales soar globally as restrictions to prevent the spread of the coronavirus sent consumers online, making it difficult for some bricks-and-mortar shops to compete.

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