The extremist group posted a chilling video showing a blood-spattered Star and Stripes next to the jihadist flag with the message in English: 'We will drown all of you in blood'.The message was accompanied by photographs of an American who was beheaded during the U.S. occupation of Iraq and victims of sniper shootings.Unlike Al Qaeda, the Islamic State has so far focused on seizing land in Iraq and Syria for its self-proclaimed caliphate, not spectacular attacks on Western targets.It came as President Barack Obama announced that Kurdish peshmerga troops, supported by U.S. jets, had recaptured the strategically important Mosul Dam, hailing the offensive as a 'major step forward'.(dailymail.co.uk)Bakudaily.Az