Pakistan has ordered all Internet service providers to block the YouTube website for containing “blasphemous” content and material considered offensive to Islam, officials said Sunday.
The telecom company that carries most of Pakistan’s traffic, PCCW, has found it necessary to shut Pakistan off from the Internet while they filter out the malicious routes that a Pakistani ISP, PieNet, announced earlier today. Evidently PieNet took this step to enforce a decree from the Pakistani government that ISP’s must block access to YouTube because it was a source of blasphemous content. — Pakistan removed from the Internet 
(…) that to block Pakistan’s citizens from accessing YouTube it is believed Pakistan Telecom “hijacked” the web server address of the popular video site.
Those details were then passed on to the country’s internet service providers so that anyone in Pakistan attempting to go to YouTube was instead re-directed to a different address.
But the details of the “hijack” were leaked out into the wider internet from PCCW and as a result YouTube was mistakenly blocked by internet service providers around the world.
The block on the servers was lifted once PCCW had been told of the issue by engineers at YouTube. — Pakistan ‘sparks YouTube outage’ 
when someone in Pakistan announced a more specific BGP route announcement for the block of IP addresses that YouTube uses. Routers default to the more specific route announcement. Now all YouTube traffic is being routed to Pakistan.