From CBS News:

A video released online Tuesday by the Islamic State of Iraq and Syria (ISIS) shows two purported Japanese hostages on their knees, as a man wielding a large knife says they will be executed unless the group receives $200 million in ransom in the next 72 hours…The militant in the video, who looks and sounds identical to a British man involved in previous ISIS beheadings known colloquially as “Jihadi John,” directly addresses Japanese Prime Minister Shinzo Abe.