In Pakistan in 1980, Azzam began to teach at International Islamic University, Islamabad. Soon thereafter, he moved from Islamabad to Peshawar, closer to the Afghan border, where he then established Maktab al-Khadamat (Services Office) to organize guest houses in Peshawar and paramilitary training camps in Afghanistan to prepare international recruits for the Afghan war front. An estimated 16,000 to 35,000 Muslim volunteers from around the world came to fight in Afghanistan. Thousands more Muslims attended "frontier schools teeming with former and future fighters." From there, Azzam was able to organize resistance directly on the Afghan frontier. Peshawar is only 15 km east of the historic Khyber Pass, through the Safed Koh mountains, connected to the southeastern edge of the Hindu Kush range. This route became the major avenue for inserting foreign fighters and material support into eastern Afghanistan for the resistance against the Soviets.