It was due to a Pakistani engineers mistake when he was attempting to carry out instructions to block YouTube from being accessed in Pakistan. I cant find the article but I read it a few hours ago. When the engineer was notified of the error, he immediately corrected it.
Heres part of the article: http://news.bbc.co.uk/2/hi/south_asia/7261727.stm
They then posted another article with the same text but also added much more around it to talk about the method the engineer used to block access and why it went wrong. Cant seem to find it now
And darn you Garri, you beat me to it AND found the article I was looking for. hahaha darn you!