Who sent this? An investigation is underway into a bomb addressed to Deutsche Bank CEO Josef Ackermann and found in the mailroom of the German bank's Frankfurt headquarters. As a result of the confirmed threat to the 63-year-old Swiss banker, New York City police stepped up security at the bank's U.S. headquarters in New York. Ackerman is one of Europe's most powerful bankers and is a key advisor in the European Union debt crisis to German Chancellor Angela Merkel. He has played an important role in the efforts to reduce Greece's debt.