chaman/quetta pakistan thousands pashtun tribal people decades ignore invisible line bisect dusty villages demarcate afghanistan-pakistan frontier brace berlin wall-style divide neighborhoods pakistan worry islamist attack build fence prevent militants criss-crossing porous 2,500 km 1,500 mile frontier along dispute colonial-era durand line draw british 1893. fence kabul oppose run middle so-called divide villages people passports pashtun tribal loyalty often trump allegiance state seven villages dot around chaman district home bustle border-crossing town chaman pakistan southwestern province baluchistan divide villages believe exist north restive federally administer tribal areas fata pakistani officials baluchistan work shift pakistani citizens divide villages side fence say security worry override concern break communities border wall germany mexico world afghanistan pakistan say col. muhammad usman commander pakistan frontier corps paramilitary force chaman tribals understand pakistan place afghanistan yet scepticism fence abound pakistan previous attempt build one fail decade ago many doubt whether possible secure lengthy border appeal erect physical border barriers wan berlin wall tear 1989. recent years several populist leaders advocate build wall curtail movement foreigners notably u.s. president donald trump want wall along entire border mexico hungary right-wing prime minister viktor orban recently fence border serbia prevent syrian refugees muslim migrants enter eastern european country act gateway european union pakistan anticipation fence plan build 100 new border post islamabad recruit excess 30,000 soldier man accord senior military source trump per requirements america per requirements pakistan add usman tense relations afghanistan pakistan boil two divide villages may pakistan census survey 10 people kill afghan border troop object census clash frontier corps killi jahangir killi luqman villages near chaman kabul islamabad accuse shelter militants provide safe havens islamist group carry cross-border attack many residents killi jahangir killi luqman welcome fence hope prevent bloodshed others concern hurt business separate friends family infiltration terrorists suspect afghan areas ... small business afghan people affect say abdul jabbar pakistani owner small enterprise killi jahangir pakistani officials long struggle impose security pashtun tribal heartland area stretch hundreds kilometers include rugged mountainous terrain hotbed arm heroin smuggle decades u.s drone strike also target militants al qaeda group region like taxi driver abdul razzaq 30 peace mind offset loss business due fence sleep home without fear say afghan-pakistan border villages brace berlin wall-style divide