President Donald Trump is preparing to preside over his first 911 commemoration in office.
The president and first lady Melania Trump plan to observe a moment of silence at the White House this morning.
The remembrance is scheduled for the time the first plane struck one of the Twin Towers on the morning of September 11th, 2001.
Meantime, closer to home, the town of Niagara on the Lake will hold a commemoration ceremony this morning.
The ceremony begins at 8:35 beside the Clock Tower at the corner of Queen and King Streets.
Nearly 3,000 people were killed in 2001 when hijackers flew commercial airplanes into New York's World Trade Center, the Pentagon and a field near Shanksville, Pennsylvania.