Pakistani men, chant prayers, during the funeral procession of aid worker Lubna Mahmoud, 26, who was killed on Tuesday, by gunmen, in Swabi, Pakistan, Wednesday, Jan. 2, 2013. (AP Photo/Mohammad Sajjad)

Photo by: Mohammad Sajjad

Pakistani men, chant prayers, during the funeral procession of aid worker Lubna Mahmoud, 26, who was killed on Tuesday, by gunmen, in Swabi, Pakistan, Wednesday, Jan. 2, 2013. (AP Photo/Mohammad Sajjad)