Article Photos: Obama summons world leaders to reject extremism



United Nations Secretary-General Ban Ki-moon greets people during the 67th session of the General Assembly at U.N. headquarters Tuesday, Sept. 25, 2012. (AP Photo/Seth Wenig)

United Nations Secretary-General Ban Ki-moon greets people during the 67th session of the General Assembly at U.N. headquarters Tuesday, Sept. 25, 2012. (AP Photo/Seth Wenig)