NEW : Raid on children 's aid organization in Pakistan 's tribal region kills three . Score: 6 Army 's top medical officer among those killed in blast in Rawalpindi . It has , in recent months , experienced several suicide bomb attacks -- including the recent assassination of Benazir Bhutto . Closely guarded city is home to the country 's military headquarters .
NEW : Raid on children 's aid organization in Pakistan 's tribal region kills three . Score: 6 Army 's top medical officer among those killed in blast in Rawalpindi . Closely guarded city is home to the country 's military headquarters .