Militants' Twitter shut over threat
Twitter has suspended the account used by Somali militants after the insurgents used the micro-blogging site to post a hostage video and death threat.
Twitter says it does not allow specific threats of violence against others in its posts.
On January 16 al-Shabab posted a statement saying it planned to kill Denis Allex, a French hostage who was the subject of a botched rescue by France's military. French officials say they believe Mr Allex died during the rescue attempt.