Iran on Monday executed a Sufi member who rammed a bus into police triying to disperse a rally, killing three of them.
Mohammad Salas was hanged early in the morning, according to the official website of the judiciary.
Salas had said that he meant no harm to anyone as he testified in March that he was trying to get away from the clashes.
The clashes took place in February when supporters of Sufi leader Nourali Tabandeh rallied outside his home, fearing his possible arrest.
Iran Government frowns on Sufism, the mystical strain of Islam. Many conservatives view it as a deviation from the faith. Rights groups say Iran is one of the world's leading executioners, and have repeatedly called on it to abolish the death penalty.
(With AP/PTI inputs)