ISIS supporters on Sunday called on jihadis around the world to kill Twitter employees because of the company's frequent blocking of their social media accounts.

"Your virtual war on us will cause a real war on you," reads an online post addressed to Twitter founder Jack Dorsey and shared by ISIS supporters.

The post, whose authorship is unclear, was accompanied by a digitally altered image of Dorsey in the cross sights of a gun.

Twitter, like YouTube, often moves quickly to delete posts and suspend accounts that disseminate ISIS videos showing the gruesome executions of hostages.

Twitter's terms of service bar users from posting or publishing "direct, specific threats of violence against others." Users are also banned from using the service "for any unlawful purposes or in furtherance of illegal activities."

"You started this failed war," the ISIS post says. "We told you from the beginning it's not your war, but you didn't get it and kept closing our accounts on Twitter, but we always come back."

"But when our lions [brave men] come and take your breath, you will never come back to life."