ISIS supporters make threats against Twitter founder Jack Dorsey — but why?

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Jack Dorsey

(CNN) — ISIS supporters have made threats against Twitter founder Jack Dorsey after the company shut down accounts promoting the terrorist organization.

In a post on an anonymous forum, the self-identified supporters drew an illusion of Dorsey in cross-hairs.

Their message contained several death threats.

Twitter’s terms of service don’t allow hate speech, threats and posts that promote terrorism.

The company says it’s working to confirm whether the threats are serious.