An Iranian revolutionary court has issued a death sentence for a man accused of "enmity against god," believed to be the first such sentence linked to mass protests in January, a source close to the man's family told Reuters on Tuesday.

Thousands of people are believed to have been killed in a crackdown on the protests, the worst domestic unrest in Iran since the era of its 1979 Islamic Revolution. During the unrest, President Donald Trump warned Tehran that he could order military action if it carries out executions.

Iran's judiciary had not yet announced the sentence on the man, Mohammad Abbasi.