On 16 June 1955, 30 Argentine Navy and Air Force aircraft bombed Plaza de Mayo, Buenos Aires' main square, killing over 300 civilians and wounding hundreds more. The attack remains to this day the largest aerial bombing ever executed on the Argentine mainland. The bombing targeted the adjacent Casa Rosada, the official seat of government, as a large crowd was gathered there expressing support for president Juan Perón. The strike took place during a day of official public demonstrations to condemn the burning of a national flag allegedly carried out by detractors of Perón during the recent procession of Corpus Christi.