From The Times
Afghanistan is replacing Iraq as the destination of choice for international jihadists, Western intelligence agencies claim. Analysts have monitored a surge in online recruitment of “lions of Islam” to join the war in Afghanistan through jihadist websites, particularly in Saudi Arabia, Pakistan, Chechnya and Turkey, in the past year.  
That is now being matched by evidence of an increase in foreign fighters entering Afghanistan, mostly from training bases established in the lawless Federally Administered Tribal Areas (Fata) of Pakistan, where Osama bin Laden is believed to be hiding.
One Kabul-based Western diplomat, who did not want to be named, said: “There is a change with an increase in attacks in the east [along the Pakistan border] and more chatter of foreign voices is being detected.”
. . . Admiral Michael Mullen, Chairman of the US Joint Chiefs of Staff, told reporters: “There are clearly more foreign fighters in the Fata than have been there in the past. What that really speaks to is that's a safe haven and it's got to be eliminated for all insurgents, not just al-Qaeda.”
Brian Glyn Williams, who researches jihadist websites for the Combating Terrorism Centre at the US military academy at West Point, told The Times that jihadist websites across the Middle East had shown a huge increase in the number of epitaphs for foreign fighters killed in Afghanistan in recent months. They have also reflected the despair of many al-Qaeda followers at the reverses the group has suffered in Iraq since the Sunni Awakening, an alliance of US forces with previously anti-government Sunni militias that turned against al-Qaeda, particularly in the province of Anbar.
Dr Williams said: “The Anbar Awakening really broke the hearts of a lot of al-Qaeda followers who saw the jihad in Iraq in black-and-white terms. Sunni Arab al-Qaeda were pushed out by fellow Sunni Arabs. Iraq is seen as a defeat. The image of Afghanistan is seen as a more pristine jihad.”
Hekmatullah Sial, a political analyst based in eastern Afghanistan, told The Times: “The local people in the eastern part of Nuristan say that more than 400 fighters, both local and foreign, are moving freely in the area. There are reports that Chechens, Arabs and Pakistanis are among them.
“It is reported that Lashkar-e-Toiba plays the leading role there,” he added, in reference to a Pakistani militant group originally backed by the country's military for operations in Kashmir. More recently Lashkar fighters have been linked to al-Qaeda.
Some of the Arabs arriving in Afghanistan are, in the words of one Western diplomat, “Saudi kids on their gap years”. Others, such as Uzbek members of the Islamic Movement of Uzbekistan, which has been fighting for more than a decade alongside al-Qaeda in Afghanistan and Pakistan, are hardened fighters.