Dina Temple-Raston

There are new glimmers of hope for the only known U.S. prisoner of war held captive in Afghanistan — 26-year-old Army Sgt. Bowe Bergdahl, who was captured by the Taliban more than three years ago. After lengthy discussions, it appears his captors may be more receptive than ever before to finding a way to send him home.

Late last month, counterterrorism officials discovered a disturbing video on YouTube that showed what appeared to be a faction of the Syrian rebel army standing in front of a fluttering black banner. The mysterious flag — which read "no god but God" in white Arabic cursive — is thought to be a reproduction of the Prophet Muhammad's battle flag. It has also become al-Qaida in Iraq's calling card in Syria.

The latest detainee to leave the Guantanamo Bay prison boarded an Air Force jet earlier this week. His destination: Sudan. The man, 52-year-old Ibrahim al-Qosi, had admitted to being Osama bin Laden's bookkeeper, driver and sometime cook, and he was one of the first prisoners to arrive at Guantanamo in 2002.

Now, he is the latest to leave. His departure brings the total detainee population at the U.S. naval base in Cuba down to 168 — from a high of 680 in May 2003.

Al-Qaida has been subtly testing a new strategy. In the past couple of years, the group's affiliates have been trying their hand at governing — actually taking over territory and then trying to win over citizens who live there. It happened with various degrees of success in Somalia and Yemen, and recently in the northern deserts of Mali.

An unusual terrorism case started in Nigeria late last week. Prosecutors in the capital city of Abuja accused two local men of being members of al-Qaida in the Arabian Peninsula, or AQAP. They were charged with accepting thousands of dollars from the group to recruit potential terrorists inside Nigeria and then send them to Yemen. Olaniyi Lawal, 31, and Luqman Babatunde, 30, have pleaded not guilty.

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The U.S. military has taken a close look at itself and found evidence of threats within its ranks.

MONTAGNE: The Pentagon, along with the FBI, has conducted more than 100 investigations into possible Islamist extremists inside the military.

NPR has learned that about a dozen of those cases are considered serious.

The FBI has conducted more than 100 investigations into suspected Islamic extremists within the military, NPR has learned. About a dozen of those cases are considered serious.

Officials define that as a case requiring a formal investigation to gather information against suspects who appear to have demonstrated a strong intent to attack military targets. This is the first time the figures have been publicly disclosed.

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Terrorists are still targeting the U.S. homeland. We were reminded of that with news this past week that al-Qaida's affiliate in Yemen plotted to blow up a plane headed to the United States.

The alleged mastermind of the Sept.11 attacks, Khalid Sheikh Mohammed, and four other defendants appeared in a military courtroom at Guantanamo Bay, Cuba, over the weekend to answer a roster of charges filed against them. The hearing was supposed to be a straightforward arraignment, but nothing went according to plan.

The appearance of Khalid Sheik Mohammed and four other men in a military courtroom at Guantanamo Bay, Cuba, ends a nearly decade-long back and forth over how best to try the men the U.S. says helped plan, pay for and execute the Sept. 11 attacks.

Khalid Sheikh Mohammed — or KSM, as he is known — has claimed that he was the mastermind of the attacks "from A to Z." But his ties to terrorism, by his own admission, go beyond that one plot. KSM saw himself as the sun around which his network revolved.

Khalid Sheikh Mohammed and four other men charged in the Sept. 11 attacks were supposed to be tried six years ago in a military tribunal created by the Bush administration.

But that system — which allowed hearsay evidence, among other things — faced questions about its fundamental fairness. When President Obama came into office, he put all the proceedings at Guantanamo on hold and asked that the commission system be revamped.

Since then, there has been an effort to make sure the trials at Guantanamo are credible, with both Congress and the Supreme Court weighing in.

The man who claims to have orchestrated the Sept. 11 attacks is expected to appear in a military courtroom this Saturday. Khalid Sheikh Mohammed and four other men are supposed to answer formal charges related to their roles in the plot.

Their arraignment will be at Guantanamo Bay, and it is the first step that leads — possibly years from now — to a military trial.

A year ago Tuesday, Navy SEALs attacked Osama bin Laden's secret compound in Pakistan and may have fundamentally changed al-Qaida as we know it.

The Obama administration's top counterterrorism chief, John Brennan, spoke Monday in Washington, D.C., and seemed on the precipice of talking about the terrorist group in the past tense.

There have been hundreds of terrorism trials in the U.S. since the attacks of Sept. 11, 2001, but the case unfolding in Brooklyn, N.Y., is different. While its focus is on defendant Adis Medunjanin and the role he allegedly played in a 2009 plot to bomb New York City subways, the trial itself breaks new ground. It marks the first time the public is hearing in open court about real al-Qaida plots from the people the terrorist group actually dispatched to carry them out.

The man accused of masterminding the bombing of the USS Cole in Yemen in 2000, Abd al-Rahim al-Nashiri, won a key battle at Guantanamo on Wednesday — a judge said he could meet with his lawyers without having to wear restraints.