Killing of Innocents Never Allowed in Islaam:
And do not kill any one whom Allah has forbidden, except for a just cause, and whoever is slain unjustly, We have indeed given to his heir authority, so let him not exceed the just limits in slaying; surely he is aided. (Al_Quraan_017.033)
Allah does not forbid you respecting those who have not made war against you on account of (your) religion, and have not driven you forth from your homes, that you show them kindness and deal with them justly; surely Allah loves the doers of justice. (Al_Quraan_060.008)