Several websites including 4chan have been blocked by major Australian telcos for continuing to host footage of the Christchurch terrorist attack.
Telstra on Tuesday blocked access to 4chan, 8chan and Voat, the blog Zerohedge and video hosting platform Liveleak.
"We understand this may inconvenience some legitimate users of these sites, but these are extreme circumstances and we feel this is the right thing to do," Telstra networks and IT executive Nikos Katinakis said in a statement.
Optus and Vodafone declined to name which domains they blocked but the same platforms also failed to load on their networks on Tuesday afternoon.
The ban on 4chan was lifted a few hours later.
Vodafone said while blocking requests normally came from the courts or law enforcement agencies "this was an extreme case which we think requires an extraordinary response".
"While there were discussions at an industry level about this issue, this is a decision Vodafone Australia came to independently," a spokeswoman said in a statement.
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