WASHINGTON (AP) -- The Libyan militant accused of masterminding the deadly Benghazi attacks that have become a flashpoint in U.S. politics pleaded not guilty to conspiracy Saturday in a federal courtroom in Washington.
In a 10-minute hearing held amid tight security, Ahmed Abu Khattala spoke just two words, both in Arabic. He replied "yes" when asked to swear to tell the truth and "no" when asked if he was having trouble understanding the proceeding.
A grand jury indictment handed up under seal Thursday and made public Saturday said Abu Khattala participated in a conspiracy to provide material support and resources to terrorists in the attacks of Sept. 11, 2012, that killed U.S. Ambassador Chris Stevens and three other Americans.
The government said it soon would file more charges against Abu Khattala.
During his initial court appearance, the defendant listened via headphones to a translation of the proceedings.
He wore a two-piece black track suit, had a beard and long curly hair, both mostly gray, and kept his hands, which were not handcuffed, behind his back.
He looked impassively at U.S. Magistrate Judge John Facciola for most of the hearing. Abu Khattala's court-appointed lawyer, Michele Peterson, entered the not guilty plea.
Facciola ordered the defendant's continued detention, but the judge did not say where Abu Khattala would be held.
The U.S. Marshals Service said it had taken custody of Abu Khattalah, who now was confined to a detention facility in the capital region, ending a harried day for the Libyan.
He was flown early Saturday by military helicopter from a Navy ship to a National Park Service landing pad in the city's Anacostia neighborhood.
U.S. special forces had captured Abu Khattala in Libya two weeks ago, marking the first breakthrough in the investigation. Officials had been questioning Abu Khattala aboard a Navy ship that transported him to the United States.
The prosecution reflects the Obama administration's stated position of trying suspected terrorists in the American criminal justice system even as Republicans call for Abu Khattala and others to be held at the U.S. detention facility in Guantanamo Bay, Cuba.
Critics say suspected terrorists don't deserve the legal protections afforded by the American court. The administration considers the civilian justice system fairer and more efficient.
A criminal complaint filed last year and unsealed after Abu Khattala's capture charged him with terror-related crimes. They included killing a person during an attack on a federal facility; that crime can be punishable by death.
The violence in Libya on the 11th anniversary of the Sept. 11 attacks on the World Trade Center and the Pentagon quickly became a political controversy at home.
Republicans accused the White House, as the 2012 presidential election neared, of intentionally misleading the public about what prompted the attacks. The White House said Republicans were politicizing a national tragedy.
Abu Khattala was a prominent figure in Benghazi's circles of extremists. He was popular among young radicals and lived openly in the eastern Libyan city, spotted at cafes and other public places, even after the Obama administration publicly named him as a suspect.
He is accused of being a member of the Ansar al-Shariah group, the powerful Islamic militia that the U.S. believes was behind the attack.
He acknowledged in an interview with The Associated Press in January that he was present during the storming of the U.S. mission in Benghazi. But he denied involvement in the attack, saying he was trying to organize a rescue of trapped people.
In the attack, gunmen fired rocket-propelled grenades and stormed the mission, with many waving the black banners of Ansar al-Shariah.
The compound's main building was set ablaze. Ambassador Chris Stevens suffocated to death inside and another American was shot dead.
At the time, several witnesses said they saw Abu Khattala directing fighters at the site.
Later in the evening, gunmen attacked and shelled a safe house, killing two more Americans. No evidence has emerged that Abu Khattala was involved in the later attack.
Abu Khattala is one of just a few cases in which the administration has captured a suspected terrorist overseas and interrogated him for intelligence purposes before bringing him to federal court to face charges.
Those cases include Osama bin Laden's son-in-law, Sulaiman Abu Ghaith, who was arrested in Jordan in March 2013 and turned over to U.S. agents. A jury in New York City convicted him in March of conspiring to kill Americans.
AP National Security Writer Robert Burns contributed to this report.
Justice Department: http://tinyurl.com/m79bngq