Nearly 3,000 people were killed when hijacked planes crashed at New York's World Trade Centre, the Pentagon and Shanksville, Pennsylvania, and the attack reshaped American foreign policy and domestic fears

President Joe Biden is due to join service members and their families at a ceremony on a military base in Anchorage, Alaska. His visit is a reminder that the impact of 9/11 was felt in every corner of the nation, however remote

Vice President Kamala Harris is joining the ceremony at the trade centre. First lady Jill Biden is due to lay a wreath at the 9/11 memorial at the Pentagon. Harris' husband, Doug Emhoff, is expected at a wreath-laying at the Flight 93 National Memorial in Shanksville

Commemorations stretch from the attack sites at New York's World Trade Centre, the Pentagon and Shanksville, Pennsylvania to Alaska and beyond

Boy Scouts and Girl Scouts raise and lower the flag at a commemoration in Fenton, Missouri, where a Heroes Memorial includes a piece of World Trade Center steel and a plaque honouring 9/11 victim Jessica Leigh Sachs. Some of her relatives live in the St Louis suburb of 4,000 residents