The United Nations called out Iran on its series of recent executions of protesters, labeling them as "state sanctioned killing."

The U.N. human rights chief, Volker Türk said the death penalty was being weaponized by Iran's government to strike fear into the population and stamp out dissent.

"The weaponization of criminal procedures to punish people for exercising their basic rights – such as those participating in or organizing demonstrations – amounts to state sanctioned killing," U.N. High Commissioner for Human Rights Volker Türk said, adding the executions violated international human rights law.

Iran hanged two men on Saturday for allegedly killing a member of the security forces during nationwide protests and more have since been sentenced to death.

The U.N. Human Rights office has received information that two further executions are imminent, the statement said, while up to 100 face charges for capital crimes.

Türk said in a statement that there were numerous violations of due process and fair trial in the cases, including the application of vaguely worded criminal provisions, denial of access to a lawyer of choice, forced confession under torture and denial of a meaningful right of appeal.

The Islamic Republic, which has blamed the unrest on its foreign foes including the United States, sees its crackdown on protests as aimed at preserving national sovereignty.

The strongly worded U.N. rights office statement comes as Türk continues to push for a trip to the country and a meeting with its Supreme Leader Ayatollah Ali Khamenei, a senior U.N. rights official Mohammad Ali Alnsour said at a Geneva press briefing on Tuesday.

A separate in-person meeting is planned between Türk and Iranian authorities "very soon," Alnsour added, without giving details.

"We cannot just stay silent when there are very serious violations," he said.

The Geneva-based Human Rights Council voted in November to set up a three-member independent fact-finding mission into Iran's crackdown on protests. Alnsour said it had already received thousands of submissions.

The protests, among the boldest challenges to the clerical leadership since the 1979 revolution, have drawn support from Iranians from all walks of life and challenged the country's legitimacy by calling for the downfall of its rulers.

The start of executions, which have been condemned by a growing number of countries, has coincided with a slowdown in the protests.