View image in fullscreenJersey City, New Jersey, USPeople observe a minute of silence honouring the victims of the September 11 terrorist attacks. The US marked the 25th anniversary of the attacks with memorials and remembrance ceremonies across the country to honour the nearly 3,000 people killed.Photograph: Andrés Kudacki/Getty ImagesShareView image in fullscreenNew York City, USA US army warrant officer stands by a reflecting pool during a memorial on the 25th anniversary of the September 11 terrorist attacks.