German labor union ver.di Tuesday called for warning strikes at German logistics and mail company Deutsche Post AG (DPW.XE) to begin Wednesday as part of an ongoing dispute over wages.

The strikes could continue for several days, ver.di said, but it didn't mention when or under what conditions the strikes could be called off.

"Our goal is clear, we want results at the next round of negotiations on April 25," ver.di representative Andrea Kocsis said.

The move comes after the union and company decided to push negotiations back until the end of April, after Monday's second round of negotiations failed to produce results.

Ver.di is seeking a 6% wage increase for about 132,000 employees of Deutsche Post, and wage increases for trainees and other employees.

The key issue that remains unresolved after Monday's talks is related to special payments to federal civil servants, Deutsche Post said.

Deutsche Post management board member Angela Titzrath, who is responsible for human resources, said before the strikes were announced that she is confident an agreement can be reached.

Negotiations are set to continue April 25.

Write to Kirsten Bienk at kirsten.bienk@dowjones.com

Shane Strowmatt contributed to this article.

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