ISIS has threatened Twitter founder Jack Dorsey and his employees after the site removed accounts linked to the extremists.
Twitter confirmed to Daily Mail Online that the company was working with authorities to verify the seriousness of the threat which claimed employees' necks are 'a target for the soldiers of the Caliphate'.
The chilling warning, written in Arabic, featured a picture of Dorsey in a gun's cross-hairs and the Twitter logo. It was posted on Sunday on an anonymous site based in Poland which is used by programmers to share code.
Dorsey, who is worth an estimated $2.5billion and lives in California, made no mention of the threat online on Sunday as he tweeted his 2.87million followers.