London (CNN Business) Workers at Amazon facilities in Germany have gone on strike in a protest over pay and working conditions as Prime Day gets underway.

The strikes, held under the slogan "No more discount on our incomes", started Sunday night at Amazon sites in Werne, Rheinberg, Leipzig, Graben, Koblenz and Bad Hersfeld, German union Verdi said in a statement.

Amazon AMZN The protests were expected to continue at least through Monday. They are being held to coincide with Amazon Prime Day — a discount event held on Monday and Tuesday forPrime customers.

"While Amazon throws huge discounts to its customers on Prime Day, employees lack a living wage," said Verdi retail specialist Orhan Akman.

The union also called for collective bargaining agreements to be made binding across Germany's retail sector.

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