9/11

The September 11 attacks resulted in 2,996 immediate deaths: 2,977 victims and the 19 hijackers. A total of 372 foreign nationals, (excluding the 19 perpetrators) perished in the attacks, representing just over 12% of the total. The immediate deaths include 246 victims on the four planes (from which there were no survivors), 2,606 in New York City in the World Trade Center and on the ground, and 125 at the Pentagon. About 292 people were killed at street level by burning debris and falling bodies of those who had jumped or fallen from the World Trade Center's windows. All the deaths in the attacks were civilians except for 55 military personnel killed at the Pentagon while some immediate victims were not added to the list until years later.
More than 90 countries lost citizens in the attacks on the World Trade Center. The other countries with the highest losses are the United Kingdom (including the British overseas territory of Bermuda) with 67, the Dominican Republic with 47, and India with 41.
In 2007, the New York City medical examiner's office began to add people to the official death toll who died of illnesses caused by exposure to dust from the site. The first such victim was a woman who had died in February 2002 from a lung condition. In 2009, a man who died in 2008 was added, and in 2011 a man who died in 2010.
Source: http://en.wikipedia.org/wiki/Casualties_of_the_September_11_attacks