The hacker group has vowed to hunt down members of the terrorist group, while creative users of imageboard 4Chan have decided to fight back with humour, using rubber ducks in an operation dubbed "Allahu Quackbar" in an effort to mock the terrorists' religious battle cry "Allahu Akbar".

"How about castrating the image of IS by replacing the faces on ALL the propaganda photos with bath ducks?" a 4Chan user wrote.

Since then, many Photoshop masters have been busy putting the heads of rubber ducks on to images featuring IS fighters.

An album called "creates the duck state" has been viewed more than 100,000 times on photo-sharing site Imgur.

"Great, now I'm scared to take a bath," commented one user.

Another wrote: "This is how we fight Daesh. Humiliate them." Daesh, ISIL and ISIS are all names used for Islamic State.

The campaign comes after Anonymous declared war on Islamic State following the terrorist attacks in Paris.

"You should know that we will find you and we will not let you go," an announcer wearing an Anonymous Guy Fawkes mask and speaking French said in a video released to the public.

"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."

The hacker collective also launched a plan to introduce Islamic State supporters to the wonderful world of Rick Astley.

Last week, the #OpParis Twitter account said it would be spamming verified ISIS hashtags on Twitter with the '80s pop star's song Never Gonna Give You Up.

The 4Chan forum, founded in 2003, is widely regarded as a place that has given birth to internet memes such as Rickrolling.

It made headlines in 2014 after nude photos of actress Jennifer Lawrence were leaked on the site.

Telegraph, London