TEHRAN: Saudi Arabia should not respond to criticism of its regime by beheading people, Iran's President Hassan Rouhani said Tuesday, referring to Riyadh's recent execution for "terrorism" of Nimr al-Nimr, a prominent Shia cleric who had been behind anti-government protests among Saudi Arabia's Shia Muslim minority.

Officials have not said how Nimr was put to death, but beheading is common in the conservative Sunni Muslim kingdom, which has since cut diplomatic ties with predominantly Shia Iran.

“One does not respond to criticism by cutting off heads,” Rouhani said as he welcomed visiting Danish Foreign Minister Kristian Jensen to Tehran.

Also read: Mass execution: Saudi Arabia beheads 47 on terror charges in one day

“I hope that European countries who always react on human rights matters will meet their duties.”

Human rights groups frequently criticise use of the death penalty in Iran, where hanging is employed.

Rouhani also accused Saudi Arabia of using the row over Nimr, which led a mob to ransack and set fire to the kingdom's embassy in Tehran, as an excuse to sever ties between the two countries.

Read more: Iran reacts with fury after Saudis execute Shia cleric

Saudi Arabia's consulate in second city Mashhad was also torched.

“Saudi Arabia cannot cover its crime of having cut off the head of a cleric by cutting relations,” he said.

The violence was condemned by Rouhani, and Iran's judiciary has said 50 people involved in the incidents, including ringleaders, have been arrested and will face legal action.

Iran's mission at the United Nations also expressed “regret” at the fireraising and disobedience in a letter to the United Nations Security Council.

'Cutting ties would not hurt Iran'

Before Rouhani spoke, a government spokesman, Mohammad Bagher Nobakht, said cutting diplomatic relations "would not hurt Iran or damage its development".

Bahrain and Sudan also broke ties with Iran, and a number of other Arab countries have recalled their envoys, in sympathy with Riyadh.

Also read: Amid Saudi-Iran spat, Kuwait recalls ambassador to Tehran

Commerce between Iran and the countries that have severed relations is low, according to official figures released Tuesday by economic daily Donaye Eghtesad.

Bilateral trade between Iran and Saudi Arabia reached $172.5 million during the first eight months of the Iranian year that began on March 20, 2015.

It comprised $132.2 million of Iranian exports, particularly fruit and steel, and $40.2 million of imports from Saudi Arabia, mainly fabrics and packaging products.

In the same period Iran exported $63.6 million of goods to Bahrain while buying only $60,000 worth from the Gulf state.

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The tension with Saudi Arabia “will have no impact on Iran's national development,” Nobakht said.

Instead, “it is Saudi Arabia that will suffer”, he argued, reiterating Tehran's harsh criticism of Nimr's killing but condemning the violence by protesters as unjustified actions “beneath the dignity of the Iranian people”.

And he compared Riyadh's “immature reaction” to the attacks with Iran's “restraint” after 464 Iranian pilgrims died in a stampede at the Haj in Saudi Arabia in September.

Read more: Iran-Saudi tensions soar over Haj stampede, arms boat

Nobahkt also said: “We condemn the inhumane, barbaric and Daesh-like execution of the cleric Sheikh Nimr,” using the Arabic acronym for the militant Islamic State group.

He said Riyadh is trying to compensate for its "political failures" in regional conflicts, naming Iraq, Syria and Yemen.

Saudi Arabia and Iran have long competed for influence in the region.

Even before Nimr's execution, relations were strained over the two nations' backing opposing factions in Syria and Yemen.

Know more: Going back in time: A look at long-fraught relations between Saudi Arabia and Iran