Saudi Arabia on Saturday executed 81 people convicted of crimes ranging from killings to belonging to militant groups, the largest known mass execution carried out in the kingdom in its modern history.

The number of executed surpassed even the toll of a January 1980 mass execution for the 63 militants convicted of seizing the Grand Mosque in Mecca in 1979, the worst-ever militant attack to target the kingdom and Islam’s holiest site.

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It wasn’t clear why the kingdom choose Saturday for the executions, though they came as much of the world’s attention remained focused on Russia’s war on Ukraine — and as the U.S. hopes to lower record-high gasoline prices as energy prices spike worldwide. British Prime Minister Boris Johnson plans a trip to Saudi Arabia next week over oil prices as well.

The number of death penalty cases being carried out in Saudi Arabia had dropped during the coronavirus pandemic, though the kingdom continued to behead convicts under King Salman and his assertive son, Crown Prince Mohammed bin Salman.

The state-run Saudi Press Agency announced Saturday’s executions, saying they included those “convicted of various crimes, including the murdering of innocent men, women and children.”

The kingdom also said some of those executed were members of al-Qaida, the Islamic State group and also backers of Yemen’s Houthi rebels. A Saudi-led coalition has been battling the Iran-backed Houthis since 2015 in neighboring Yemen in an effort to restore the internationally recognized government to power.

Those executed included 73 Saudis, seven Yemenis and one Syrian. The report did not say where the executions took place.

“The accused were provided with the right to an attorney and were guaranteed their full rights under Saudi law during the judicial process, which found them guilty of committing multiple heinous crimes that left a large number of civilians and law enforcement officers dead,” the Saudi Press Agency said.

“The kingdom will continue to take a strict and unwavering stance against terrorism and extremist ideologies that threaten the stability of the entire world,” the report added. It did not say how the prisoners were executed, though death-row inmates typically are beheaded in Saudi Arabia.

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An announcement by Saudi state television described those executed as having “followed the footsteps of Satan” in carrying out their crimes.

The executions drew immediate international criticism.

“The world should know by now that when Mohammed Bin Salman promises reform, bloodshed is bound to follow,” said Soraya Bauwens, the deputy director of Reprieve, a London-based advocacy group.

The kingdom’s last mass execution came in January 2016, when the kingdom executed 47 people, including a prominent opposition Shiite cleric who had rallied demonstrations in the kingdom.

In 2019, the kingdom beheaded 37 Saudi citizens, most of them minority Shiites, in a mass execution across the country for alleged terrorism-related crimes.

The 1979 seizure of the Grand Mosque remains a crucial moment in the history of the oil-rich kingdom.

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A band of ultraconservative Saudi Sunni militants took the Grand Mosque, home to the cube-shaped Kaaba that Muslims pray toward five times a day, demanding the Al Saud royal family abdicate. A two-week siege that followed ended with an official death toll of 229 killed. The kingdom’s rulers soon further embraced Wahhabism, an ultraconservative Islamic doctrine.

Since taking power, Crown Prince Mohammed under his father has increasingly liberalized life in the kingdom, opening movie theaters, allowing women to drive and defanging the country’s once-feared religious police.

However, U.S. intelligence agencies believe the crown prince also ordered the slaying and dismemberment of Washington Post columnist Jamal Khashoggi, while overseeing airstrikes in Yemen that killed hundreds of civilians.

In excerpts of an interview with The Atlantic magazine, the crown prince discussed the death penalty, saying a “high percentage” of executions had been halted through the payment of so-called “blood money” settlements to grieving families.

“Well about the death penalty, we got rid of all of it, except for one category, and this one is written in the Quran, and we cannot do anything about it, even if we wished to do something, because it is clear teaching in the Quran,” the prince said, according to a transcript later published by the Saudi-owned satellite news channel Al-Arabiya.

“If someone killed someone, another person, the family of that person has the right, after going to the court, to apply capital punishment, unless they forgive him. Or if someone threatens the life of many people, that means he has to be punished by the death penalty.”

He added: “Regardless if I like it or not, I don’t have the power to change it.”