From BBC NEWS:
Instructions were issued to internet service providers across Pakistan on 27 February to block about a dozen websites of various origins.

The ban comes amid protests in several Muslim countries against the cartoons, first published in Denmark last year.

Islamic tradition prohibits depictions of the Prophet.

Bloggers in Pakistan first became aware of the ban on 28 February when they were unable to access a popular blog hosting site, Blogspot.

One of the blocked sites is hosted on Blogspot, which led to the blocking of all web journals hosted on the site.

The Pakistan bloggers found their blogs blocked, even though their blogs are not connected with the cartoons.
And apparently, according to one's internet provider, this has also spilled over into India.  So Google cuts them off from Blogspot, even when they haven't broken the rules.