New Delhi, May 6 -- The Supreme Court on Monday sought a response from the Centre on a petition seeking quashing of an order blocking a YouTube channel, 4PM, citing "national security" and "public order". The plea said that the blocking order was effected by the intermediary, in this case YouTube, following an undisclosed direction from the Centre. A bench of justices BR Gavai and KV Viswanathan agreed to hear the plea and issued notices to the Centre and others seeking their responses. The plea, filed by Sanjay Sharma who is the editor of digital news platform "4PM" with 7.3 million subscribers, has alleged that the blocking was a "chilling assault on journalistic independence" and the right of public to receive information. Senior advocat...