Scott Shane New York Times

The identification of Khalid and Ibrahim El Bakraoui as suicide bombers in the deadly Brussels attacks is confronting investigators and counterterrorism experts with a disturbingly recurrent question: Why do so many terrorists turn out to be brothers?

By the time Mahmoud Jibril cleared customs at Le Bourget airport and sped into Paris, the U.S. secretary of state had been waiting for hours. But this was not a meeting Hillary Clinton could cancel. Their encounter could decide whether America was again going to war.

The onslaught of recruitment propaganda has multiplied the number of online enthusiasts for the Islamic State in the United States.

NSA has cracked the encryption, that guards sensitive data like trade secrets, medical records, Web searches, Internet chats and phone calls.

The United States has now endured what by some measures is the longest period of war in its history, with more than 6,300 American troops killed and 46,000 wounded in Iraq and Afghanistan and the ultimate costs estimated at $3 trillion. Both wars lasted far longer than predicted.

A string of aggressive gestures by Iran this week -- assassination attempts on Israelis living abroad that were attributed to Tehran, renewed posturing over its nuclear program and fresh threats of economic retaliation -- suggest that Iranian leaders are responding frantically, and with increasing unpredictability, to the tightening of sanctions by...

A feared wave of homegrown terrorism by radicalized Muslim Americans has not materialised, with plots and arrests dropping sharply over the two years since an unusual peak in 2009, according to a new study by a North Carolina research group. The study, to be released on Wednesday, found that 20 Muslim Americans were charged in violent plots or atta...

On his second yearlong deployment to Afghanistan, Lt. Col. Daniel L. Davis travelled 9,000 miles, patrolled with American troops in eight provinces and returned in October of last year with a fervent conviction that the war was going disastrously and that senior military leaders had not levelled with the American public.

To a colourful group of Americans - the Washington terrorism expert, the veteran C.I.A. officer, the Republican operative, the Kansas City lawyer - the Libyan gambit last March looked like a rare business opportunity.

In a shift of tactics that has alarmed American officials, the anti-secrecy organization WikiLeaks has published on the Web nearly 134,000 leaked diplomatic cables in recent days, more than six times the total disclosed publicly since the posting of the leaked State Department documents began last November.

The Norwegian man charged Saturday with a pair of attacks in Oslo that killed at least 92 people left behind a detailed manifesto outlining his preparations and calling for a Christian war to defend Europe against the threat of Muslim domination, according to Norwegian and American officials familiar with the investigation.

American counterterrorism officials all but welcomed the announcement on Thursday that Ayman al-Zawahiri would succeed Osama bin Laden as leader of Al Qaeda, arguing that his deep flaws are likely to weaken the core of the terrorist network.Defense Secretary Robert M. Gates said Bin Laden "had a peculiar charisma that I think Zawahiri does not have...

A fat sheaf of FBI reports meticulously details the surveillance that counterterrorism agents directed at the one-story house in East Austin. For at least three years, they traced the license plates of cars parked out front, recorded the comings and goings of residents and guests and, in one case, speculated about a suspicious flat object spread ou...

The enormous cache of computer files taken from Osama bin Laden's compound contained a considerable quantity of pornographic videos, American officials said on Friday, adding a discordant note to the public image of the Islamist militant who long denounced the West for its lax sexual mores. The officials, speaking on condition of anonymity about cl...

CIA interrogators questioned three wives of Osama bin Laden for the first time on Thursday, 10 days after they were taken by Pakistani security forces from the compound where the Al Qaeda leader was killed, an American official confirmed on Friday.The official, who spoke on condition of anonymity, declined to give any details about the duration of ...

The identification of Khalid and Ibrahim El Bakraoui as suicide bombers in the deadly Brussels attacks is confronting investigators and counterterrorism experts with a disturbingly recurrent question: Why do so many terrorists turn out to be brothers?

By the time Mahmoud Jibril cleared customs at Le Bourget airport and sped into Paris, the U.S. secretary of state had been waiting for hours. But this was not a meeting Hillary Clinton could cancel. Their encounter could decide whether America was again going to war.

The onslaught of recruitment propaganda has multiplied the number of online enthusiasts for the Islamic State in the United States.

NSA has cracked the encryption, that guards sensitive data like trade secrets, medical records, Web searches, Internet chats and phone calls.

The United States has now endured what by some measures is the longest period of war in its history, with more than 6,300 American troops killed and 46,000 wounded in Iraq and Afghanistan and the ultimate costs estimated at $3 trillion. Both wars lasted far longer than predicted.

A string of aggressive gestures by Iran this week -- assassination attempts on Israelis living abroad that were attributed to Tehran, renewed posturing over its nuclear program and fresh threats of economic retaliation -- suggest that Iranian leaders are responding frantically, and with increasing unpredictability, to the tightening of sanctions by...

A feared wave of homegrown terrorism by radicalized Muslim Americans has not materialised, with plots and arrests dropping sharply over the two years since an unusual peak in 2009, according to a new study by a North Carolina research group. The study, to be released on Wednesday, found that 20 Muslim Americans were charged in violent plots or atta...

On his second yearlong deployment to Afghanistan, Lt. Col. Daniel L. Davis travelled 9,000 miles, patrolled with American troops in eight provinces and returned in October of last year with a fervent conviction that the war was going disastrously and that senior military leaders had not levelled with the American public.

To a colourful group of Americans - the Washington terrorism expert, the veteran C.I.A. officer, the Republican operative, the Kansas City lawyer - the Libyan gambit last March looked like a rare business opportunity.

In a shift of tactics that has alarmed American officials, the anti-secrecy organization WikiLeaks has published on the Web nearly 134,000 leaked diplomatic cables in recent days, more than six times the total disclosed publicly since the posting of the leaked State Department documents began last November.

The Norwegian man charged Saturday with a pair of attacks in Oslo that killed at least 92 people left behind a detailed manifesto outlining his preparations and calling for a Christian war to defend Europe against the threat of Muslim domination, according to Norwegian and American officials familiar with the investigation.

American counterterrorism officials all but welcomed the announcement on Thursday that Ayman al-Zawahiri would succeed Osama bin Laden as leader of Al Qaeda, arguing that his deep flaws are likely to weaken the core of the terrorist network.Defense Secretary Robert M. Gates said Bin Laden "had a peculiar charisma that I think Zawahiri does not have...

A fat sheaf of FBI reports meticulously details the surveillance that counterterrorism agents directed at the one-story house in East Austin. For at least three years, they traced the license plates of cars parked out front, recorded the comings and goings of residents and guests and, in one case, speculated about a suspicious flat object spread ou...

The enormous cache of computer files taken from Osama bin Laden's compound contained a considerable quantity of pornographic videos, American officials said on Friday, adding a discordant note to the public image of the Islamist militant who long denounced the West for its lax sexual mores. The officials, speaking on condition of anonymity about cl...

CIA interrogators questioned three wives of Osama bin Laden for the first time on Thursday, 10 days after they were taken by Pakistani security forces from the compound where the Al Qaeda leader was killed, an American official confirmed on Friday.The official, who spoke on condition of anonymity, declined to give any details about the duration of ...