Initially, the Sunni outfits thrived by pitting the poor Sunni tenants against the rich Shia landlords in Jhang district of Punjab. As it is not easy to identify Shias, generally the Sunni militants target prominent Shias, whose sectarian identity is known due to their eminence.
Other targets are clerics, Imambarah and processions specific to Shia community like the Ashura and Chelhum processions. Also, the Shia pilgrims travelling to holy places in Iraq and Iran by buses have become their targets.
Of late, they have used suicide bombings quite effectively to target Shia congregations. Shia retaliation has by and large been restricted to targetting Sunni clerics preaching hatred against Shias and members of Sunni militant organisations.
There are, however, some exceptions to the general pattern. In areas where Shias are in a majority, like Parchinar in Kurram Agency and Gilgit-Baltistan in Pakistan-administered Kashmir, they fight pitched battles with the Sunni outfits.
Secondly, in Karachi, due to its large population, Shias are able to come out in strength and protest. It is also in Karachi that the largest numbers of Sunni militants have been killed in reprisal.