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 "enmity against God", state media reported.

He was accused of being a "rioter" who blocked a main road in Tehran on 25 September and wounded a member of the paramilitary Basij force with a knife.

An activist said he was convicted after a "show trial without any due process".

Mahmood Amiry-Moghaddam, director of Norway-based Iran Human Rights, tweeted that executions of protesters would start to take place daily unless Iranian authorities faced "rapid practical consequences internationally".