The Anonymous hackers collective is preparing to unleash waves of cyberattacks on Islamic State following the attacks in Paris last week that killed 132 people, it said in a Youtube video posted online.

A man wearing their signature mask, a Guy Fawkes mask said the Islamic State militants who claimed responsibility for the Paris attacks were "vermin" and Anonymous would hunt them down.



"These attacks cannot remain unpunished," the man said in the video, speaking in French.

"The French people are stronger than you and will come out of this atrocity even stronger. Anonymous from all over the world will hunt you down."

"We are going to launch the biggest operation ever against you. Expect many cyberattacks. War has been declared. Get ready," the man said, without giving details of what the attacks would involve. "We don't forgive and we don't forget."

Anonymous is an international network of activist computer hackers which has claimed responsibility for many cyberattacks.