Sydney Hilton Hotel bombing
The Sydney Hilton Hotel bombing occurred on 13 February 1978, when a bomb exploded outside the Hilton Hotel in George Street, Sydney, Australia. The hotel was hosting the first Commonwealth Heads of Government Regional Meeting (CHOGRM), a regional offshoot of the biennial meetings of the heads of government from across the Commonwealth of Nations.
Source: Wikipedia — Sydney Hilton Hotel bombing (CC BY-SA 4.0)