BERLIN — German authorities searched the headquarters of Deutsche Bank in Frankfurt and other offices on Thursday on the suspicion bank employees helped clients set up offshore companies in tax havens to launder hundreds of millions of euros, in an investigation brought about from an analysis of online document leaks. Frankfurt prosecutors’ spokeswoman Nadja Niesen said the investigation was focused on two Deutsche Bank employees, aged 50 and 46, and possibly other not-yet identified suspects. Some 170 prosecutors, state police, national police and tax investigators were involved in the morning searches of six buildings in Frankfurt, and in nearby Eschborn and Gross-Umstadt, Niesen said. The investigation was launched after evaluation of the explosive Panama Papers tax haven revelations and the previous Offshore Leaks report of offshore bank accounts, she said.