He was detained in Kabul in July , his family says . Officials say that in August 2010 , group set off from U.S. for tribal areas of Pakistan . Police detained a group member before he left ; one others arrested after arriving in Pakistan . Agencies think other members of the group remain in the Iranian / Pakistan border area . Border area group is linked to plot that prompted advisory for Pakistan citizens traveling in Europe .
Officials say that in August 2010 , group set off from U.S. for tribal areas of Pakistan . Police detained a group member before he left ; one others arrested after arriving in Pakistan . Agencies think other members of the group remain in the Iranian / Pakistan border area . Border area group is linked to plot that prompted advisory for Pakistan citizens traveling in Europe .