The documents, to be made available by an organization called WikiLeaks, suggest that Pakistan, an ostensible ally of the United States, allows representatives of its spy service to meet directly with the Taliban in secret strategy sessions to organize networks of militant groups that fight against American soldiers in Afghanistan, and even hatch plots to assassinate Afghan leaders…

Some of the reports describe Pakistani intelligence working alongside Al Qaeda to plan attacks. Experts cautioned that although Pakistan’s militant groups and Al Qaeda work together, directly linking the Pakistani spy agency, the Directorate for Inter-Services Intelligence, or ISI, with Al Qaeda is difficult…

Behind the scenes, both Bush and Obama administration officials as well as top American commanders have confronted top Pakistani military officers with accusations of ISI complicity in attacks in Afghanistan, and even presented top Pakistani officials with lists of ISI and military operatives believed to be working with militants…

American officials have described Pakistan’s spy service as a rigidly hierarchical organization that has little tolerance for “rogue” activity. But Pakistani military officials give the spy service’s “S Wing” — which runs external operations against the Afghan government and India — broad autonomy, a buffer that allows top military officials deniability.