Human rights organisations place the death toll at more than 5,000, and have estimated that up to 20,000 people have been detained.  TEHRAN: Limited internet access briefly returned in Iran before dropping again, a monitor said Sunday (Jan 18), 10 days into a communications blackout that rights groups said aimed to mask a violent protest crackdown that killed thousands .  Iran's president warned that an attack on the country's supreme leader would be a declaration of war - an apparent response