The fatalities could come from any number of countries.
Current strength (31 August 2009)
9,123 total uniformed personnel, including 7,057 troops and 2,066 police, supported by 492 international civilian personnel, 1,221 local civilian staff and 205 United Nations Volunteers
Contributors of military personnel Argentina, Bolivia, Brazil, Canada, Chile, Croatia, Ecuador, France, Guatemala, Jordan, Nepal, Paraguay, Peru, Phillipines, Sri Lanka, United States and Uruguay.
Contributors of police personnel Argentina, Benin, Brazil, Burkina Faso, Cameroon, Canada, Central African Republic, Chad, Chile, China, Columbia, Côte d'Ivoire, Croatia, DR Congo, Egypt, El Salvador, France, Guinea, India, Jamaica, Jordan, Madagascar, Mali, Nepal, Niger, Nigeria, Pakistan, Philippines, Romania, Russian Federation, Rwanda, Senegal, Serbia, Spain, Sri Lanka, Switzerland, Togo, Turkey, United States, Uruguay and Yemen.
More info on the U.N. forces:
http://www.un.org/depts/dpko/missions/minustah/facts.html For those uncertain about why the U.N. has a force in Haiti in the first place:
Long report put out by the United Nations:
http://www.un.org/depts/dpko/missions/minustah/background.html