The videotapes produced by Khorasan and other groups offer a stark picture of their spy hunt. A review of 20 video confessions by The New York Times, as well as interviews with residents of the tribal belt, suggest the suspects are largely poor tribesmen.

Death is not inevitable, however. Suleman Wazir, a 20-year-old goat herder from South Waziristan, said militants abducted him in September.

“They told me I would die,’’ he said in a video interview recorded through an intermediary in Waziristan. But after some weeks, Wazir said, his relatives intervened through tribal elders and persuaded the Taliban of his innocence. After presenting five goats to the militants, he was set free, he said.

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