Afghan police officers stand guard at the scene of a suicide attack in Kabul, Afghanistan, Tuesday, Dec. 6, 2011. (AP Photo/Musadeq Sadeq)

Photo by: Musadeq Sadeq

Afghan police officers stand guard at the scene of a suicide attack in Kabul, Afghanistan, Tuesday, Dec. 6, 2011. (AP Photo/Musadeq Sadeq)