The Mar 16 attack hit a drug treatment centre and killed 411 people, according to Afghan officials.  KABUL: Samira Muhammadi hopes an international investigation can "extinguish" her pain after a Pakistani bombing killed her son and hundreds of other Afghans in the capital Kabul last month.  The Mar 16 attack hit a drug treatment centre and killed 411 people , according to Afghan officials.  A United Nations source, speaking to AFP on condition of anonymity, said they had verified at least 250