DUBAI, United Arab Emirates (AP) — Iran executed a second prisoner on Monday convicted over crimes committed during the nationwide protests challenging the country's theocracy, publicly hanging him from a construction crane as a gruesome warning to others.

The execution of Majidreza Rahnavard came less than a month after he allegedly fatally stabbed two members of a paramilitary force after purportedly becoming angry about security forces killing protesters.

The development underscores the speed at which Iran now carries out death sentences handed down for those detained in the demonstrations...