Prosecutor Michael Neff confirmed a report in the Märkische Oderzeitung newspaper on Sunday, which reported that the break-in occurred late Friday night.
The unknown thieves smashed a window with a rock and took a computer from the offices of the group's chairman, Wladimir Lewitzky. The computer contained personal data of all 217 members of the group. The intruders also took €400 and a checkbook from the bookkeepers office, according to the newspaper.
On the previous Thursday, the group found a flyer in its mailbox containing threats against Jews and a swastika symbol. Investigators are now looking into whether there is a connection between the break-in and the flyer.
The Jewish Community in Frankfurt an der Oder, located on the Polish border, has already received several anonymous threats this year.