Anonymous hackers have breached Freedom Hosting II, a popular Dark Web hosting provider, and have taken down 10,613 .onion sites.
Since all websites were interconnected by Freedom Hosting II's underlying infrastructure, all sites have been defaced with the same message.
Hacker group Anonymous has admitted it took down Nissan's global and Japanese websites as a protest against Japanese dolphin culling.
Anonymous announced responsibility of the DDoS attack via its Twitter account, saying: "#Anonymous #OpKillingBay .@NissanJP nissan.co.jp #TangoDown #Japan stop the killing now!" with a photo montage of dolphins and Nissan cars.
On September 15, 2014, two British back papers, Hannah Witheridge, 23 and David Miller, 24, were killed on the Thai Island of Koh Tao.
Soon after the crime, Thai police arrested two Myanmar migrant workers, which a Thai court sentenced to death in December 2015.
The United Nations confirmed Thursday reports that activist group Anonymous leaked personal data from some 1,400 people using its climate website, as the world gathered in Paris to craft a climate rescue pact.
"I can confirm there was a hacking incident earlier this week and that has been handled by the conference's IT security experts," said UN climate secretariat spokesman Nick Nuttall, who declined to make any further comment.
A group associated with Anonymous has reportedly hacked an alleged Islamic State supporter website and replaced it with a message to chill out and an advertisement for an online pharmacy.
It's been reported IS and IS supporter websites are moving their websites onto the dark web in an attempt to stay protected and hidden online.