President Barack Obama urged Americans to stay true to the country's values today in a moving speech delivered at the Pentagon on the 15th anniversary of the 9/11 terrorist attacks on 11 September 2016.

Speaking from the Pentagon in Washington DC – the headquarters of the US military, which a group of al-Qaeda terrorists deliberately crashed a 747 plane into during the 9/11 attacks – the US president urged his citizens to stay true to America's ideals and remain a "beacon to the world".

In a moving speech, the president paid homage to the nearly 3,000 men, women and children who died in the attacks.

Obama also called on Americans to mark the occasion by believing in their country's principle: "Perhaps most of all we stay true to the spirit of this day by defending not only our country but also our ideals."

Read the full transcript of President Obama's speech below.

President Obama 9/11 anniversary speech 3
US President Barack Obama, Defense Secretary Ash Carter (unseen) and Joint Chiefs Chair General Joseph Dunford (right) take part in a ceremony marking the 15th anniversary of the 9/11 attacks at the Pentagon in Washington DC, 11 September 2016. Joshua Roberts/Reuters