The New Yorker magazine reports, “What was supposed to be a limited
evacuation apparently slipped out of control and, as an unintended
consequence, an unknown number of Taliban and al-Qaeda fighters
managed to join in the exodus.” A CIA analyst says, “Many of the
people they spirited away were in the Taliban leadership” who Pakistan
wanted for future political negotiations. US intelligence was
“supposed to have access to them, but it didn’t happen,” he says.
According to Indian intelligence, airlifts grow particularly intense
in the last three days before the city falls on November 25. Of the
8,000 remaining al-Qaeda, Pakistani, and Taliban, about 5,000 are
airlifted out and 3,000 surrender.
http://www.historycommons.org/timeline.jsp?timeline=afghanwar_tmln&afghanwar_tmln_us_invasion__occupation=afghanwar_tmln_pakistan_involvement#a0901isiaidstaliban