President Obama laid a wreath at the memorial in rural Pennsylvania where another plane was brought down after passengers fought their al-Qaeda hijackers. He's done the same at a ceremony that's taking place at the Pentagon, which was hit by a fourth hijacked aircraft. Earlier at the Pentagon, the US Defence Secretary Leon Panetta said the United States was a safer and stronger country now than it was a decade ago.
"In the wake of the attacks, a generation of Americans stepped forward to serve in uniform,
determined to
confront our enemies. Because of their sacrifices, we are a safer and stronger nation today, and the principal terrorist behind these attacks has been brought to justice."
People from more than 100 nations were killed in the 9/11 attacks, and memorial ceremonies have been held around the world, including London. In Italy, Pope Benedict held a special Mass. But on the eve of the events in Afghanistan, a Taliban suicide bomber attacked a Nato base in the central province of Wardak, killing two Afghans and wounding more than 100, most of them American soldiers.
World News from the BBC
The Niger government says that one of Muammar Gaddafi's sons, Saadi, has arrived in the country. The justice minister said Saadi Gaddafi was in a convoy heading for Agadez, in north Niger. From the capital Niamey, Thomas Fessy sent us this report.
Al-Saadi Gaddafi was in the latest convoy which has crossed into Niger. He was with eight other people whose identities have not been confirmed, according to the Justice Minister and government spokesman Marou Amadou. Security forces