This day remembers the people killed in the 11th September attacks in 2001 in the United States. It was first commemorated a year after the attacks, after a national day of mourning was introduced in the U.S. House on 25th October 2001 by Rep. Vito Fossella with 22 co-sponsors. The flag of the United States is flown at half mast at the White House and on all U.S. government buildings and establishments throughout the world. A moment of silence is held at 8.46 a.m. Eastern Daylight Time at the time the first plane struck the North Tower of the World Trade Center. It is not a federal holiday but memorial ceremonies are held for the 2,977 victims from that day (excluding the 19 hi-jackers who also died).