"KRL is the only institution that our country can boast of in the world, where we are on a par with the developed world," said Shafiq-ur Rahman, whose father, Sajawal Khan Malik, the lab's retired head of maintenance and general services, was detained Saturday.
Until recently, the detentions would have been unthinkable, but since the Sept. 11, 2001, terror attacks in the US, President General Pervez Musharraf has become a key US ally.
Pakistan has denied officially proliferating nuclear technology, but has acknowledged that rogue individuals may have been the source of leaks.
The government has acknowledged detaining "five to six" scientists and administrators for what it calls "debriefings." Almost none has been released, relatives say, and no formal appearances or charges have been made in court.
"We are moving toward the conclusion of these debriefing sessions," Foreign Ministry spokesman Masood Khan said Monday. "We haven't made our final determination yet. There is no presumption of guilt. It is probable that some of these people would be cleared."



