Presidential candidates Donald Trump and Hillary Clinton momentarily paused their bitter rivalry and separately joined the people at the 9/11 memorial in downtown Manhattan to honour the 2,977 people killed and the thousands left injured when al-Qaeda terrorists crashed hijacked planes into the twin towers of the World Trade Centre.
People carried pictures of their loved ones who died in the attacks and placed flowers and American flags in the names inscribed into bronze panels edging the twin reflecting pools at the memorial site.
The pools sit within the footprints where the Twin Towers once stood and the names of every person who died in the 2001 attacks as well as in the 1993 World Trade Centre bombing are inscribed into the Memorial pools.
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The memorial is visited by thousands of city residents and tourists daily to offer homage to those killed in the attacks.
A new freedom tower, 'One World Trade Centre', now stands next to the memorial and a museum has also been erected that houses relics, including flags and equipment from the time the towers fell.
It tells the stories of the thousands of firefighters, ordinary citizens and law-enforcement authorities who helped save countless lives and toiled day and night to find the survivors in the wreckage.
New York Governor Andrew Cuomo said flags will fly at
half-staff on state buildings for the nearly 3,000 individuals who lost their lives in the 2001 terrorist attacks.
Two planes crashed into World Trade Centre, leaving 2,753 dead. A third hit the Pentagon in Washington, killing 184, and 40 more died after a fourth plane headed for Washington crashed into a field in Pennsylvania after passengers overpowered the hijackers.
Several Indians working in the twin towers and those in the area were among the victims. New Jersey resident Arjan Mirpuri lost his 30-year old son Rajesh that fateful day. Mirpuri had said his son did not even work at the World Trade Centre but had gone there that day to attend a trade show.
The family and friends of 25-year-old Neil Shastri established a foundation in his name and to honour his life, which was taken away in the attacks. The Foundation said on its website that its mission is to continue Shastri's legacy by engaging in various philanthropic endeavours that reflect his generous spirit and passion for learning.
"Neil was taken from his wife, parents, brothers, and friends much too early and a left a void that will never be filled. Through the Neil G Shastri Foundation, Neil's family and friends hope that they are honouring his memory by touching a few lives and doing some good in ways that Neil was never able to do," the foundation said.