By Imtiaz Ali in Dawn, October 10th, 2023KARACHI: While a crackdown on illegal immigrants across the country is underway, police and allied agencies have so far picked up over 1,700 Afghan nationals for living in Karachi without any valid documents, it emerged on Monday. The information about the number of held persons was shared by caretaker Home Minister retired Brigadier Haris Nawaz, who also declared that all illegal immigrants living in Sindh would soon be…