Pro-Iran hackers have threatened to release emails supposedly stolen from people connected to President Donald Trump, according to a news report, a move that federal authorities call a ''calculated smear campaign.

The Cybersecurity and Infrastructure Security Agency warned that a “hostile foreign adversary” is threatening to release material reportedly stolen from Trump and several of his allies.

DUBAI - Iranian authorities have arrested hundreds of people and executed half a dozen in a sweeping security crackdown that analysts say is aimed at exerting control after a brief but punishing war with Israel exposed Iran’s deep infiltration by Israeli intelligence.