One of Germany's largest trade unions called on Tuesday for renewed strikes by employees of US online retailer Amazon, with workers walking out of a warehouse in the southern town of Graben.
There were also reports of further strike action at a depot in Leipzig in eastern Germany.
Thomas Schneider, who is leading the strikes staged by the union Verdi, said that around 400 employees will be taking part in the latest bout of industrial action.
Verdi has been campaigning without success since 2013 for a collective labour contract, meaning that logistics centre staff would be paid at rates applicable in German retail warehouses.
Amazon pays the lower hourly rate that prevails in the German freight industry.
The online retail giant, which has nine dispatch centres in Germany and employs over 10,000 people there, claimed that the strikes have had no effect on its customers.
Last week, workers held strikes at a variety of Amazon locations across Germany.