The first casualties occurred in the Tarnak Farm incident, in which four Canadians were killed and eight seriously wounded when a United States warplane dropped a bomb on a training exercise in the belief that the Canadians were enemy soldiers. The four servicemen were honoured at an event unprecedented in Canada 2002, Skyreach Centre in Edmonton, Alberta, was filled to capacity for a tribute ceremony for the four deceased soldiers that included personal messages from the Governor General Adrienne Clarkson, Prime Minister Jean Chretien, the Chief of Defence Staff, Premier of Alberta and Premier of Manitoba, and the Mayor of Edmonton, Alberta, most of whom also attended the service. Subsequently, deceased soldiers have been honoured by much smaller services.