Andy Burnham and Sir Tony Blair marked the 25th anniversary of the 9/11 terrorist attacks on Friday, with Burnham warning that terror "still knocks at the door of democracy" while affirming the enduring bond between the UK and US. The anniversary comes amid ceremonies held on both sides of the Atlantic to honour the nearly 3,000 people killed, including 67 Britons, and to reaffirm shared democratic values in the face of ongoing terrorist threats.

Burnham drew parallels with terrorist attacks in Manchester during his time as mayor, recalling messages of support sent by children of 9/11 victims to the families of those killed in Manchester. Blair, who was prime minister at the time of the attacks, described 9/11 as the worst terrorist atrocity ever committed and the largest loss of British lives to terrorism, calling for renewed efforts to combat terrorism and pursue peaceful coexistence. The attacks on 11 September 2001 saw hijacked passenger jets strike the World Trade Centre's twin towers and the Pentagon, killing 2,977 people in total.