Bombing of the Vienna International Centre

The Bombing on the United Nations was an event in Vienna, Austria during the signing of the Sokovia Accords.

History
During the signing of the Sokovia Accords, the United Nations building in Vienna was bombed by Helmut Zemo, leading to multiple deaths, including the wakandan king T'Chaka, though not a single Avenger was killed in the bombing. Zemo was disguised as Bucky Barnes, the infamous Winter Soldier.