Pakistan : Two bombs explode at a Sufi shrine . NEW : Violence has spread to Punjab , Pakistan 's heartland . NEW : Human rights panel calls on government and people to stand up to terrorism . The attack kills 50 , wounds more than 100 .
NEW : Two bombs explode at revered Sufi shrine . NEW : Violence has spread to Punjab , Pakistan 's heartland . NEW : Human rights panel calls on government and clerics to stand up to militants . Shrine attack kills 50 , wounds more than 200 .