Millions around the world will be remembering the victims of the September 11 terrorist attacks tomorrow, a decade after fanatical extremists used hijacked US airliners to murder nearly 3,000 people.
Families and friends of those killed in the atrocity, who included 67 Britons, will mark the 10th anniversary at memorial events around the globe.
Britain suffered more losses in the September 11 2001 attacks on New York and Washington DC than any other country apart from America itself.
The main anniversary event in the UK will be held at the September 11 memorial garden next to the American Embassy in Grosvenor Square, London.
About 30 of the bereaved British families will attend a remembrance ceremony in the garden, at which the names of the victims will be read out and a white rose laid for each one.
Memorial services will also be held at St Paul's Cathedral in the morning and at Westminster Abbey in the evening.
Relatives of about 10 UK victims have travelled to New York for the events organised by the US authorities at Ground Zero, the former site of the World Trade Centre.
The Britons killed in the suicide attacks included bankers, brokers, journalists and computer experts who had gone to work as usual on an apparently unexceptional late summer's day 10 years ago.
Islamist terrorists hijacked four passenger jets, deliberately flying the first into the north tower of the World Trade Centre at 8.46am local time (1.46pm British time).
Other aircraft were smashed into the World Trade Centre's south tower and the Pentagon in Washington DC before the final plane crashed in a field in Pennsylvania after a group of passengers fought back against the hijackers.