Trump threatens Iran over protest crackdown as deadly unrest flares

U.S. President Donald Trump threatened on Friday to come to the aid of protesters in Iran if security forces fire on them, days into unrest that has left several dead and posed the biggest internal threat to Iranian authorities in years.

“We are locked and loaded and ready to go,” he said in a social media post. The United States struck Iranian nuclear facilities in June, joining an Israeli air campaign that targeted Tehran’s atomic programme and military leadership.

Top Iranian...