Employees at Germany's Postbank are expected to stage further strikes in the coming days as part of a wage dispute with the firm, a subsidiary of German financial giant Deutsche Bank.
The trade union verdi has called on around 4,500 back-office workers at Postbank, who process banking transactions, to strike over the course of the week.
The latest strike call follows a series of smaller strikes last month that shuttered Postbank branches.
Verdi negotiator Jan Duscheck said that back-office employees at Postbank have faced heavy work burdens in recent months as the bank switches its computer systems to those used by Deutsche Bank.
"This is precisely why we finally expect a negotiation offer that takes this fact into account and includes fair salary increases," Duscheck said.
Verdi is demanding raises of at least 15.5%, or a minimum of €600 ($644) per month, for around 12,000 Postbank employees in its collective bargaining talks with the Deutsche Bank Group.
The Deutsche Bank Employees' Association (DBV) is likewise seeking raises of 14.5% for employees of Postbank, Postbank Branch Sales, PCC Services and BCB.
Verdi is also demanding greater job security in the wake of Postbank's announcement last year that it plans to close as many as 250 of Postbank's 550 branches by mid-2026.
The trade union wants the bank to commit to avoiding mandatory redundancies until at least the end of 2028.