Maybe it is my low IQ, but could you explain how killing your own citizens is a message to Iran? Are you suggesting that since they were Shia, their death is supposed to hurt Iranians, rather than Pakistanis? If not, do explain how it is revenge - Iran shoots rockets at your people, so in revenge, you bomb your people? I think it is clear that somebody either has a low IQ, or is a bigot who thinks that his own country's Shia people are Iran's responsibility.
@DESERT FIGHTER : On a thread about a muslim man being murdered in India a few days ago, you tagged me and said you hope I'm all right. Should I return the favor and inquire about your well being in the light of this incident?
On topic, condolences to the departed. Unfortunately, such occasions present a soft target, to sectarian terrorists. It is impossible to secure every religious gathering or procession, the only way to eliminate these acts of terror is to eliminate all the terrorists.