Video - In Tehran, Iraqi Hizbullah Leader: We Will Retaliate Militarily for Al-Nimr Execution on Saudi Soil.

During a press conference at the Fars News Agency in Tehran, Sheikh Akram Kaabi, Leader of the Hizbullah Al-Iraq ("Al-Nujaba") militia, threatened Saudi Arabia: "Our retaliation for the blood of Sheikh Al-Nimr will take place on your own turf." He further said: "When I say that we will retaliate - of course, I mean military retaliation." The statements were posted on the Internet on January 20, 2016.

Top Iraq Cleric al-Sistani Says Saudi Executions an 'Aggression'.

Ayat. #Sistani condemns the killing of Mu'mins from Qatif, incl. Sh. #Nimr, whose blood was oppressively shed. #KSA pic.twitter.com/nDnFHkTEa4

— Hezbollah Watch (@HezbollahWatch) January 3, 2016

Top Iraq Cleric al-Sistani Says Saudi Executions an 'Aggression' . (Naharnet).

The execution of prominent Saudi Shiite cleric Nimr al-Nimr is an "aggression", Iraq's top Shiite authority Grand Ayatollah Ali al-Sistani said in a statement Sunday.

"We received with deep sadness and regret the news of the martyrdom of a group of our brothers in the region," he said.

"The spilling of their pure blood -- including of the late cleric Sheikh Nimr al-Nimr, may his soul rest in peace -- is an injustice and an aggression," Sistani said.

Other leading Shiite clerics in Iraq have reacted with outrage to the execution on Saturday by the Saudi authorities of Nimr and other Shiite activists.

They were among a total of 47 people, most of them described by the interior ministry as involved in killings by Al-Qaeda.

Moqtada al-Sadr, a well-known cleric who heads the Saraya al-Salam militia, said Nimr's execution was a "horrible attack" against Shiites and called for international condemnation.

Mohammed Taqi al-Mudaresi, another cleric who is based in the holy Shiite city of Karbala, took a harder line.

"The execution of the martyr (Nimr) isn't just a declaration of war against the People of the House (Shiites) but against all Muslims," he said in a statement.

The executions also sparked a wave of anger in neighbouring Iran, where protesters firebombed the Saudi embassy in Tehran.

The #Iran Army issued a communique' saying also "The act of Saudi Arabia will turn against it and it is time to stop it". #Nimr.

— Elijah J. Magnier (@EjmAlrai) January 3, 2016

💥 Hezbollah's Nasrallah: #SaudiArabia must understand that now there is price they must pay 4 such actions& we will make them pay the price.

— Hasan Sari (@HasanSari7) January 3, 2016