US presidents Joe Biden, Barack Obama and Bill Clinton all gathered at the site where the World Trade Center towers fell two decades ago in New York in the deadliest terror attack in the country that marked the start of a new era of fear and war.
Money, design and tenancy drag out construction at the 9/11 site that honours the nearly 3,000 people killed in the attacks, with two planned skyscrapers, a performing arts centre and a church still unfinished.
The order has been hailed by the families of the 9/11 victims as a milestone in their years-long effort probing into the attacks.
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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