( CNN ) -- Authorities are investigating a letter bomb addressed to the CEO of Deutsche Bank that was delivered to the bank 's headquarters in Frankfurt , Germany , police said Wednesday . The device , which contained shrapnel , was detected in the bank 's mail room around 1 p.m. local time , said New York Deputy Police Commissioner Paul Browne . It did not detonate . `` The return address was listed as a European central bank , which would likely increase the chances of him opening it , '' said Browne , who urged a general increase in mail room security . `` A suspicious letter was received today at Deutsche Bank , addressed to Dr. ( Josef ) Ackermann , '' said bank spokesman Ronald Weichert . `` In-house departments concerned alerted the police , '' who then launched an investigation . Browne said the incident prompted New York authorities to increase security around Manhattan 's Deutsche Bank offices . CNN 's Susan Candiotti and Diana Magnay contributed to this report .
A letter bomb is addressed to the employees of Deutsche Bank . It is delivered to the bank 's headquarters in Frankfurt , Germany , police say . New York 's deputy police chief said the device was detected in the bank 's mail ##box .