Iran has announced the first execution of a protester convicted over the recent anti-government unrest.
Mohsen Shekari was hanged on Thursday morning after being found guilty by a Revolutionary Court of "moharebeh" (enmity against God), state media said.
He was accused of being a "rioter" who blocked a main road in Tehran in September and wounded a member of a paramilitary force with a machete.
An activist said he was convicted after a "show trial without any due process".
"The international community must immediately and strongly react to this execution," Mahmood Amiry-Moghaddam, director of the Norway-based group Iran Human Rights, said in a statement.
"If Mohsen Shekari's execution is not met with serious consequences for the government, we will face mass execution of protesters," he added.