The news has added to the sense of crisis around the bank triggered by a $14 billion demand from the U.S. authorities for mis-selling mortgage-backed securities.

The German government this week denied a newspaper report that it was working on a rescue plan for the bank whose problems are sending tremors through global markets.

Chief Executive John Cryan addresses reports of the departure of “some few” hedge fund clients, blaming “speculation” and “certain forces” for what he called unsettling media coverage.

“We should look at the complete picture,” Cryan said in the letter to the bank’s workforce of around 100,000.

“Deutsche Bank has more than 20 million customers.”

Cryan said the bank was stable, with a sufficiently large capital cushion. “We are and remain a strong Deutsche Bank.”