There might not have been any because the highway does not have heavy traffic as the region has very low population density as the strip along the Arabian Sea is forbidding desert badly carved by erosion. It was this stretch that saw Alexander the Great lose most of his army during his retreat from Pakistan along the Gedrosian coast.
The fact is that 15 men were able to do this and walk away point to gross, nay neglicence of the highest order. Only in failed countries would a band of such men be able to perpetrate this act and walk way. Given the geography the gang should have been cornered and eliminated by now.
And pointing fingers abroad is bullshat. The fact is the failure was at home ~ that outsiders might or might not have exploited is besides the point.
Another sectarian faggot comes along to point fingers living in some large city [Karachi?] who has never served in the frontlines, never had a relative serve in the frontlines in entire generations and most likely never paid any tax either but is ever ready to start new confrontations.