As America watches in horror at events in Florida, millions are gathering to remember another tragedy which has left huge scars on the country.
Today marks the 16th anniversary of 9/11, arguably the biggest and most traumatic news story in the Western world since the end of the Second World War. In case anyone needs reminding, nearly 3,000 people lost their lives when hijackers crashed planes into the World Trade Center, the Pentagon and a field in nearby Pennsylvania.
The collapse of the Twin Towers shocked the world, and pave the way for the hugely controversial US-led invasions of Iraq and Afghanistan. Sixteen years on, 9/11 remains the most infamous terrorist atrocity of all time.
As is now an annual tradition, New York has been awash with tributes to mark the day. Click on the gallery to see the pictures.