Ireland has made statements concerning Eritrea to the UN Human Rights Council twice this year.
“Individuals who are arrested for religious reasons are systematically subjected to ill-treatment and torture,” the OHCR said.
Ruled by a military dictatorship, Eritrea has an estimated 500 Christian prisoners of faith.
The Nobel Prize committee refuses to revoke Prime Minister Abiy Ahmed's Nobel Peace Prize despite accusations of ethnic cleansing.
UN agencies estimate that hundreds of thousands of Eritreans have fled the country to Ethiopia, Sudan and Egypt in recent years.
Prison conditions are some of the harshest in the world, with inmates kept in shipping containers and believers often tortured.
Some 171 Eritrean Christians have been freed from prison since last August.
Eritrean troops are participating in serious human rights violations and violence that may amount to genocide.
In 2019, Thomson Reuters reported that more than 500,000 refugees worldwide have left Eritrea, up from 486,200 a year earlier.