200 children are to take part in a special memorial ceremony to mark the second anniversary of the 11 September terrorist attacks in New York.
In 2001 al-Qaeda flew two hijacked planes into the Twin Towers of the World Trade Center in the US city.
The children, who all lost members of their family in the disaster, will read out the names of nearly 2,800 victims who died on that day.
The memorial service will take place in the area where the towers stood - it's now called Ground Zero.
Hundred of people are expected at the ceremony, including relatives of those who died, and Rudolph Giuliani - New York's mayor when the attack happened.
There'll be four minutes of silence to mark the times when each plane crashed into the towers, and when each tower collapsed.
Meanwhile, a video supposedly showing Osama Bin Laden has been shown on al-Jazeera TV - a big Middle East broadcaster.
Bin Laden's thought to be behind the 11 September attacks.
A voice on the tape paid tribute to the terrorists and promised more attacks.
But it's not certain yet if the tape is real or not.