A message posted online, allegedly by the Islamic State of Iraq and Syria (ISIS) militants has urged jihadis to kill Twitter founder Jack Dorsey and Twitter employees after accounts of ISIS members were taken down from the social media site.

Although the message posted on the website JustPaste.it was unverified, Twitter Inc. and law enforcement authorities are not taking the message lightly.

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In reaction to media reports, Twitter said it is coordinating with law enforcement authorities in investigating the alleged threats made by ISIS.

"Our security team is investigating the veracity of these threats with relevant law enforcement officials," a representative for Twitter said in a statement on Monday.

One post allegedly by the Islamic State supporters said "Your virtual war on us will cause a real war on you", reported Buzzfeed.

The message displayed an image of Dorsey in the crosshairs of a gun.

The threat was issued by alleged ISIS militants after Twitter and other social media sites shut down accounts of suspected militants.

Twitter have removed content and suspended accounts that post gruesome content, including videos and photos of executions.

Twitter's guidelines specifically bar users from posting content that calls for threats of violence against others. As such, the site has been busy removing ISIS accounts almost as soon as they pop up.

It was not the first time that Twitter received threats from ISIS. Sources said the social media site in October received a threat from ISIS, which said that the management and employees of Twitter should be assassinated.

In the last post supposedly by ISIS, the militant group issued the following threat:

"You started this failed war. 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...For the 'individual jihadi' all over the world, target the Twitter company and its interests in any place, people, and buildings, and don't allow any one of the atheists to survive."

TagsTwitter death threat, ISIS Twitter, Jack Dorsey