Dozens of people demonstrated outside a prison in Iran overnight amid reports authorities were preparing to execute another two anti-government protesters.
Opposition activists posted videos showing people chanting slogans in front of Rajai Shahr jail in the city of Karaj.
The mother of Mohammad Ghobadlou, one of the two men at risk of execution, appealed for clemency at the gathering.
Two protesters were hanged on Saturday, prompting international condemnation.
The UN human rights office deplored the "shocking" executions of Mohammad Mahdi Karami and Seyed Mohammad Hosseini, which it said followed "unfair trials based on forced confessions".
A Revolutionary Court found the men guilty of "corruption on Earth" over their alleged involvement in the killing of a member of the paramilitary Basij force in Karaj in November. Both denied the charge and said they were tortured.
They were the third and fourth people to be executed in connection with the protests that erupted in September following the death in custody of a woman detained by morality police for allegedly wearing her hijab "improperly".
Authorities have portrayed them as "riots" and responded with lethal force.
So far, at least 519 protesters and 68 security personnel have been killed in the unrest, according to the Human Rights Activists' News Agency (HRANA).
It says that another 19,290 protesters have been arrested and that 111 of them are believed to "under the impending threat of a death sentence", having been convicted of, or charged with, capital offences.
People gathered outside Rajai Shahr prison on Sunday night after activists warned that Mohammad Ghobadlou and Mohammad Boroughani had been transferred to solitary confinement in preparation for execution.
Opposition activist collective 1500 Tasvir published videos showing a crowd chanting slogans warning authorities against proceeding with the executions. Shouts included "I will kill who has killed my brother" and "This is the last warning. If you execute [them] there will be an uprising/revolt."
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