sentences:  "CNN" hired the Institute for Science and International Security to examine the documents they found, and its President, David Albright, confirmed the abandoned documents included plans for a nuclear bomb, and extensive training notes on the handling of radiological material.The Combatting Terrorism Center reported that Abu Hafs al Masri (aka Mohammed Atef), al Qaida's military chief, was killed in an air strike on an ""al Qa'ida safehouse"" in Kabul, in November 2001.American counter-terrorism analysts called many of the houses "safe houses", even when the captives stayed in these houses during the time the Taliban was in power.