Facebook's New York headquarters is reportedly on high alert following threats made by Isis to its founder Mark Zuckerberg in a propaganda video.
Released earlier this week, the video targets Zuckerberg and Twitter chief executive Jack Dorsey and according to reports officers from the NYPD's Emergency Service Unit were on patrol near both Twitter and Facebook's offices on Friday (26 February).
However, it appears there has been no direct request from Facebook for extra protection. The NYPD's Emergency Service Unit routinely patrols ares perceived to be at risk.
The video, released by a group calling itself 'the sons of Caliphate army', takes aim at Zuckerberg and Dorsey for removing Isis accounts from their social platforms.
Speaking at Mobile World Congress last week, Zuckerberg addressed extremist postings on the site and said: "We don't want people doing that kind of stuff on Facebook.
"If we have opportunities to basically work with governments and folks to make sure that there aren't terrorist attacks then we're going to take those opportunities and we feel a pretty strong responsibly to help make sure society is safe."
According to the Next Web, these threats towards the chief executives are nothing new and both are regularly bombarded with intimidating messages over censorship policies around extremism.