<sod >A bomb exploded at a vegetable market on the outskirts of the Pakistani capital on Wednesday, killing 20 people and injuring about 70, police and hospital officials said.< eod>< sod > A deadly bomb exploded at a vegetable market on the outskirts of the Pakistani capital on Wednesday, killing at least 22 people and injuring about 75 in the deadliest attack in Islamabad in several years.< eod>