ISIS has renewed its death threat to employees of micro-blogging site Twitter, Inc. (TWTR), particularly its co-founder Jack Dorsey. The threats are in retaliation for Twitter blocking accounts which are affiliated to or support the Islamic State.

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Twitter has a policy of barring users from posting threats or using the service for furthering of illegal activities.

Twitter released a statement saying that, "Our security team is investigating the veracity of these threats with relevant law enforcement officials."

According to reports, ISIS supporters on Sunday targeted Twitter employees, specifically co-founder Jack Dorsey, threatening to "take your breath" and that "you will never come back to life." The threat was reportedly posted on a Poland-based anonymous site.

According to a translation posted on BuzzFeed, the ISIS post says, "Your virtual war on us will cause a real war on you. 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."

This is that second time that such threats are being issued. An account alleged to be related to ISIS issued a call last summer to "lone wolves" to assassinate Twitter employees.

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