ISLAMABAD: The Pakistan Telecommunication Authority (PTA) on Thursday directed all internet service providers concerned to shut down YouTube in view of growing sacrilegious content on the website. The PTA took the step after using all possible avenues within its jurisdiction, including using regular channels available on Facebook and YouTube to launch protests against the publishing of derogatory material available on their websites -- which increased in number as time passed by. The PTA has so far blocked more than 450 links on the Internet containing derogatory material, according to a press release. The PTA has already announced a phone number and a complaint number to receive complaints on the issue.