Investigators searched the offices of Germany's biggest lender Deutsche Bank on Friday, prosecutors said, with the focus on the bank's anti-money-laundering activities.

Officers from the BKA federal police, the financial watchdog BaFin and the prosecutors office in Frankfurt had been "deployed" at the scene, they said. 

The raid was linked to "suspicious activity reports filed by the bank" in relation to money-laundering, Deutsche Bank said in a statement, adding that it was cooperating with authorities.

Deutsche Bank has in recent years been closely watched by financial authorities in relation to suspicious transactions.

BaFin in 2021 called on management at the lender to redouble their efforts to tackle money-laundering activities.

Investigators searched Deutsche Bank's headquarters in 2019 for failing to report possibly illicit money flows. 

The Frankfurt-based group also came under scrutiny for its role as a correspondence bank that handled foreign transactions for Danske's Estonian branch, at the centre of a €200-billion money-laundering affair between 2007 and 2015.

Deutsche Bank subsequently agreed to pay a fine of €13.5 million for failing to report suspicious activity quickly enough, after an investigation by Frankfurt prosecutors. 

Deutsche Bank shares fell on the Frankfurt Stock Exchange after the news was reported by local media, trading around minus 2.9 at 13:30 local time (1130 GMT).