Iran says it has carried out a second execution linked to the anti-government protests engulfing the country.
Majidreza Rahnavard was hanged "in public" early on Monday in the city of Mashhad, the judiciary announced.
A court convicted him of the charge of "enmity against God" after finding he had stabbed to death two members of the paramilitary Basij Resistance Force.
Human rights groups have warned that protesters are being sentenced to death after sham trials with no due process.
"Rahnavard was sentenced to death based on coerced confessions, after a grossly unfair process and a show trial. This crime must be met with serious consequences for the Islamic Republic," tweeted Mahmood Amiry-Moghaddam, director of Norway-based Iran Human Rights.
"Thousands of detained protesters, and a dozen death sentences already issued. There is a serious risk of mass-execution of protesters," he added.