Pakistan Telecommunication Authority has Block WordPress.com temporarily in Pakistan due to severe issues related to national security. It appears now that blocking decision is somewhat related to Pakistan day.WordPress.com will be unblocked in two days from now
Tech Crunch is WordPress site who has been blocked from within Pakistan but self-hosted WordPress blogs are still working.
Pakistan has always maintained strict internet laws and sites like Facebook, Wikipedia, IMDb, and Twitter etc. have experienced temporary bans in Pakistan. The other on-going ban is on YouTube which is in practice since September 2012 for featuring a trailer of an anti-Islam movie.
The Pakistan Telecommunication Authority (PTA) is responsible for the block.