BERLIN, (Reuters) – German Amazon warehouse workers began striking Monday. Verdi, a services sector union, said that this was in response to a long-running dispute with the U.S. tech company over improved pay and working conditions.

Germany is Amazon’s second largest market, after the United States. Verdi, the leading union in the services sector, has organized strikes at Amazon sites across the country every day since 2013, to protest the low wages and bad working conditions.

Verdi claimed that the Union had called for the current strike in order to request a raise in wages in accordance with agreement reached between the union and the wider German retail and postal industries.

According to the union, workers in three Amazon warehouses located in the state of Saxony, Hesse, would strike Monday. This coincides with All Saints Day in certain German states.

It is not known how many employees joined the strike Monday.

Verdi stated that workers at four additional locations will strike in the morning hours Tuesday. The strikes could last anywhere from 24 hours up to three full days.

Orhan Akman, a representative of Verdi said that it was unacceptable for a multi-billion dollar corporation to refuse to pay employees wage increases comparable to other businesses in the sector.

Verdi stated that it would like Amazon to recognize the collective agreements within the retail and mail-order industries and to come to an agreement regarding fair working conditions.

Amazon stated in a statement, “Amazon offers great pay and benefits as well as career opportunities.”

According to the company, there was no impact from the strike on clients.

Amazon stated earlier this year that it will guarantee a minimum wage of 12.50 euro ($13.9) per hour at its German warehouses starting in July. This amount will increase to 11.50 euros by autumn 2022.

Amazon’s earnings exceed Germany’s minimum wage, which is 9.60 Euros per hour. Germany’s minimum wages will rise to 12 euro if a coalition of centre-left Social Democrats and Greens, as well as the Liberal Free Democrats, can reach an agreement.

($1 = 0.8641 euros)