December 29, 2003 (Monday)
- Papal Nuncio to Burundi, Irish-born Archbishop Michael Courtney, is killed in an ambush. [1]
- The United States Department of Homeland Security announces that it will require armed security personnel on all airline flights, whether US or foreign carriers, when the department has intelligence that there is a threat to a flight. [2]
- Cuban officials are investigating who is responsible for altering a photograph of Fidel Castro on the front page of the official government newspaper, Granma, to make him look like Adolf Hitler. [3]
- The Federal Bureau of Investigation issues a memo instructing police to be alert of people carrying almanacs, stating that information in these reference works could be used to aid in the planning of terrorist attacks. [4]