It once seemed that justice for the 9/11 plotters was close at hand.

“They will be brought to New York — to New York — to answer for their alleged crimes,” then-Attorney General Eric Holder said emphatically at a news conference in 2009.

What You Need To Know

Accused 9/11 mastermind Khalid Sheikh Mohammed and four co-conspirators have been detained at Guantanamo since 2006, but have yet to face trial

The case has been mired in years of delays since being transferred to a military commission in 2009

A plea agreement struck last year with three of the defendants was thrown out by a federal appeals court in July, further delaying the process

A planned trial in federal court in Lower Manhattan was scrapped following a public uproar, largely over safety and security concerns.

Instead, th

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