Iran has  vowed to  fast-track trials for people arrested over a massive wave of protests, after US President Donald Trump threatened very strong action if the Islamic Republic goes ahead with hangings.

International outrage has built over a crackdown on the demonstrations, which a rights group said has likely killed thousands in one of the biggest challenges yet to Iran’s clerical leadership.

Iranian authorities have insisted they have regained control of the country after successive nights of mass protests, repeatedly accusing the demonstrators of carrying out acts of terror of the kind committed by Islamic State.

Trump  in a News interview that the United States would act if Iran began hanging protesters.

Meanwhile, Rights groups accuse the government of fatally shooting protesters and masking the scale of the crackdown with an internet blackout imposed on January 8.

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