The United Nations’ top human rights official on Friday urged Iran to halt executions immediately, warning that dozens of people could face the death penalty following the first capital sentence connected to January’s mass protests.

Speaking before the United Nations Human Rights Council in Geneva, U.N. High Commissioner for Human Rights Volker Türk said he was “horrified” by reports that at least eight individuals — including two minors — have been sentenced to death in relation to the demonstrations.

Türk added that as many as 30 others may also be at risk of receiving death sentences.

According to a source close to the family of one of the defendants, a revolutionary court in Tehran has issued a death sentence against a man accused of “enmity against God,” a charge often used in cases involving political unrest. If upheld, it would mark the first confirmed execution order tied directly to the wave of protests that erupted in January.

The U.N. rights chief called for an immediate moratorium on capital punishment in Iran, expressing concern over what he described as escalating reprisals linked to the unrest.