Limited internet access briefly returned in Iran before dropping again, a monitor said Sunday, 10 days into a communications blackout that rights groups said aimed to mask a 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 to U.S. counterpart Donald Trump saying it was time to look for new leadership in Iran.

Demonstrations sparked in late December by anger over economic hardship exploded into protests widely seen as the biggest challenge to the Iranian leadership in years.

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