The concerned agencies are finding it difficult to proceed with legal action against these websites in the absence of any co-operation from domain registrars and other entities in the US and Europe where their servers are based, official sources said.

These websites have been accused of allowing anti-national content and propaganda of various terror groups, including that of banned ISIS (Islamic State of Iraq and Syria), to be hosted on their platforms.

The government recently blocked 32 websites following a Mumbai court order, citing serious national security concerns.

Out of these, only seven websites responded to the notices sent by the Indian authorities and assured that they would not allow their platforms to be used for propagating terror-linked materials.

Unfazed by criticism on micro-blogging sites like Twitter on its move to block these 32 websites, including popular video and other content sharing platforms such as DailyMotion and Vimeo, the government has made it clear that there would be no compromise on national security.

The crackdown followed after it was found that the content were being posted on these websites with an intention to create unrest, break communal harmony, which may result in law and order problems and lead to breach of peace and tranquillity, officials at the Department of Electronics and IT (DeitY) said.

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