German authorities raided Deutsche Bank AG offices Thursday as part of an investigation into whether the firm helped clients launder money through tax havens. One of the employees suspected of involvement works in the division responsible for fighting financial crime, according to people familiar with the matter.

Around 170 police officers and other officials seized documents during searches through six different properties Thursday, including one employee’s home, according to authorities.

The raid was a visible sign of mounting legal problems for the German lender, which has faced a string of allegations and costly legal settlements tied to failures to prevent money laundering and other banking violations.

Thursday morning, police vehicles lined up outside Deutsche Bank’s central Frankfurt headquarters, and German federal police and other officers crowded into the lobby of the high-rise towers. Officers soon filtered upstairs onto other floors of the bank to search records, a person inside the bank said.

Not long after, Randal Quarles, the Fed’s vice chairman for supervision, arrived for a prescheduled lunchtime meeting with Deutsche Bank’s chief executive Christian Sewing and regulatory chief Sylvie Matherat, people familiar with the matter said.