On Saturday I started seeing threads of complaints in the Google Webmaster Help forums that google.com.pk, Google Pakistan, was taken over by Turkish hackers.
Here is a screen shot of what Google Pakistan looked for a few hours on Saturday:
This was reportedly a DNS hack, where the hackers took control of the domain name records or server. They also hacked Microsoft and other large profile companies.
You can read more about this at Hackers Media.
So if your Google Pakistan traffic was down a bit on Saturday - this may be why.
Forum discussion at Google Webmaster Help.