The fragile peace along the Pakistan-Afghanistan frontier has once again collapsed. Destructive cross-frontier shelling in the last week has killed several dozen persons, shelled civilians’ enclaves, and closed border crossing points. What once appeared to most a smouldering controversy regarding militant safe havens has ballooned into military strikes that risk destabilising a troubled region. The controversy is over long-disputed territory: the Durand Line. Pakistan has blamed Afghanistan again under Taliban rule for hosting Tehreek-e-Taliban Pakistan (TTP) militants that stage attacks inside Pakistan.