NEW : Most of the employees are locals . Raid on children 's aid center in Pakistan 's tribal region killed three . Suicide bombing struck Pakistan 's military HQ , killing four people . Pakistan 's top medical officer among those killed in blast in Rawalpindi . Closely guarded area is home to the country 's military headquarters .
NEW : Raid on children 's aid center in Pakistan 's tribal region killed three . Suicide bombing struck Pakistan 's military HQ , killing four people . Pakistan 's top medical officer among those killed in blast in Rawalpindi . Closely guarded area is home to the country 's military headquarters .