are muhajirs - not consider muslims in pakistan- but claim to be one as the ahmadis?
muhajir get on the nerves of some 'sons of the soil' Punjabi and pushtoons etc. Sindhis feel mohajirs have taken over their province. muhajirs in turn feel they have lost a lot for Pakistan leaving behind their properties in India and getting some of theirs killed during migration so they deserve a place.
This is the gist of the tension between various communities although other things add up over time.