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Online hackers are spamming ISIS supporters on Twitter by following them with THOUSANDS of graphic porn accounts.

The accounts, known as 'pornbots', feature nothing but graphic sexual images and are automatically generated, but almost never tweet and therefore cannot be deleted as spam.

The hackers target tweeters who use a lot of ISIS hashtags and strike rapidly, sometimes following them with several hundred accounts in just a few minutes.

One of their targets is a prolific French ISIS account, which recently shared a video of an ISIS execution of six Syrians with the caption: "Ahh, I love these videos..."

Another ISIS account, also run by a French fighter, often has tweets about journalists in Iraq and Syria warning that they are just as responsible for the deaths of innocent people as US soldiers .

WATCH: Anonymous release video threat to ISIS

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(Image: Twitter)

The account had barely 50 followers until yesterday, when it was followed by more than 800 Pornbots in just a few hours.

Some accounts have been deluged by as many as 4,000 of the explicit images, which the jihadists find incredibly offensive because of their religion - a twisted interpretation of Islam.

Last week the official ISIS media agency Amaq was also struck by the phenomenon.

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(Image: Twitter)

Hundreds of Pornbots followed the account before it was later disabled by Twitter.

Several ISIS accounts have since been made private by their users whilst the jihadists struggle to find a way to stop the tide of naked bodies.

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(Image: Twitter)

One possible culprit is the hacking group Anonymous, which has declared cyber war on the murderous terror group.

Soon after the Paris terror attacks an Anonymous supporter, wearing their trademark hood and mask and speaking with a computerised voice, told listeners: "Our freedom is once again under attack

"This cannot continue.

"Following the attacks in Paris last November, we have fought daily against terrorism and we have silenced thousands of Twitter accounts directly linked to ISIS

"We severely punish Daesh (another name for ISIS) on the dark net, hacked their electronic portfolio and stolen money from the terrorists."

The militant group controls swaths of territory in Syria and Iraq and has claimed responsibility for several major attacks in various countries, including coordinated attacks in Paris in November that killed 130 people.