ISIS supporters threaten Mark Zuckerberg and Jack Dorsey in 25-minute video that shows the Facebook and Twitter CEOs riddled with bullet holes

Islamic State supporters have threatened Facebook CEO Mark Zuckerberg and Twitter CEO Jack Dorsey in a new video attacking their efforts to wipe terrorist accounts from social media.

The 25-minute video titled Flames Of The Supporters, found by Vocativ on Wednesday, features pictures of both entrepreneurs covered in bullet holes.

In it, the militants claim they control more than 10,000 Facebook accounts, 150 Facebook groups and 5,000 Twitter profiles - and warn they will retaliate to any attempt to drive them off the sites. 

Text flashes up on the screen, which reads: 'To Mark and Jack, founders of Twitter and Facebook and to their Crusader government.

'If you close one account we will take 10 in return and soon your names will be erased after we delete your sites, Allah willing, and will know that we say is true,' it warns in subtitles.

The clip was published on Telegram - a social media site popular with ISIS militants - by a group that calls itself 'the sons of the Caliphate army', Vocativ reports. 

Facebook declined to comment on the video.

Twitter has yet to respond to Daily Mail Online's request for a comment on the video and its threats.

It comes after both Zuckerberg and Dorsey announced an intense push against terrorist users on their social networks.

Twitter has closed at least 125,000 accounts tied to the Islamic State, which uses the social network as one of its key media to spread propaganda. 

Facebook has vowed to follow suit. Sheryl Sandberg, the firm's chief operating officer, also called on users to 'attack' any terrorist-linked posts with 'likes'. 

Last year, the extensive list of encrypted messaging services, email providers, and GPS blockers ISIS use to dodge restrictions emerged in a 34-page handbook written for the jihadis.

It was obtained by independent military research group Combating Terrorism Center (CTC), and published on Scribd by Yahoo.

In it, jihadis are told not to use Instagram because its owner, Facebook, 'has a bad reputation in the protection of privacy'.

Messaging services WhatsApp and Line are also banned as they require the internet and cannot be easily masked by encryption devices.

And Dropbox is off-limits because 'Snowden advised not to use the service', and former Secretary of State Condoleeza Rice is on the board of directors.

Instead, jihadis are to add a virtual private network (VPN) to their mobile browsers, which allows you to mask your location and use a foreign IP address, making it look to outsiders like you are in another city or country.

If they upload pictures to sites such as Twitter, which shows the geographic location of an image, they are advised to use apps such as Mappr, which can falsify GPS.

When they do use Twitter, they are advised to 'always check location' to ensure it is switched off or shows somewhere else.

To send images or messages to each other, they use FireChat, which allows phones within a 200-meter radius to connect without using the internet.

And emails can be sent using Hushmail Service or Tutanota - just two of dozens of encrypted email apps.

The handbook, written in Arabic, gives readers different options for iPhones and Android phones, and lists whether an app costs money or not.