Commanders gave journalists a guided tour of the bastion, which one general said numbered 156 caves developed over five to seven years, and carved into sheer rock within clear view of the snow-capped peaks in eastern Afghanistan.

The visit follows Pakistan's latest offensive against militants in its semi-autonomous tribal badlands, launched under US pressure to eliminate Taliban and Al-Qaeda-linked groups who attack Western troops in Afghanistan.

Major General Tariq Khan accompanied journalists to the warren of caves in the area of Damadola that he said served as a key militant headquarters until troops overran the complex in an offensive launched in January.