Campaigners call for greater global action after deaths of Mohammad Mahdi Karami and Seyyed Mohammad Hosseini
Iran drew international condemnation on Saturday after it executed two men for killing a paramilitary force member in November during protests sparked by the death in custody of a young woman.
The latest killings double the number executed so far in connection with the nationwide protests. Two men were put to death in December, sparking global outrage.