As children and grandchildren honored loved ones they never knew, Americans marked the 25th anniversary of 9/11 with tributes to the fallen and renewed calls for unity.

Here's how New York City is marking 25 years since 9/11 with a series of tributes honouring those who lost their lives

The U.S. marks the 25th anniversary of 9/11. Events will honor those lost, at a time when Americans are divided about the meaning and legacy of the terrorist attacks.