Americans honour nearly 3,000 people killed on September 11, 2001 in a solemn ceremony at ground zero, where hijacked planes brought down the Twin Towers.
Nearly 3,000 people died when hijacked planes slammed into the original World Trade Center towers, the Pentagon and a Pennsylvania field. Fifteen of the 19 attackers were Saudis.
The US judge said that the allegations in the New York lawsuit met the requirements for the court to assume jurisdiction under the country's Justice Against Sponsors of Terrorism Act.
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