In the wake of the deadly Paris terror attacks claimed by ISIS, a hacker group called ‘Anonymous’ released a Youtube video vowing retaliation against them and ISIS has responded by calling them idiots, with instructions to its followers on how to avoid getting hacked. 

The hacker group said, "Anonymous from all over the world will hunt you down. You should know that we will find you and we will not let you go. We will launch the biggest operation ever against you. "Expect massive cyber attacks. War is declared. Get prepared. The French people are stronger than you and will come out of this atrocity even stronger."

ISIS responded through its unofficial Telegram channel, "The #Anonymous hackers threatened in new video release that they will carry out a major hack operation on the Islamic state (idiots).”

It added, “Don't open any links unless sure of the source. Change Internet Protocol addresses "constantly." And "do not talk to people [you] don't know on Telegram" or through Twitter direct messaging.”

The hacker group ‘Anonymous’ is involved in issuing a list of Twitter accounts, which they claim are spreading ISIS propaganda.

A group of eight terrorists had attacked various sensitive places in France on Friday night in a series of well-coordinated attacks, leading to the death of 129 people so far and leaving more than 300 injured. While seven terrorists have been neutralized, one is believed to be on the run, reports CNN.

The attacks have attracted worldwide condemnation with France declaring it a war and threatening to intensify its attacks against ISIS in Syria.

This is the video released by the hacker group: