Iraq hanged 13 convicted extremists on Friday after Prime Minister Haider Al Abadi vowed a forceful response to calm public anger over the murder of abducted civilians by ISIS.
While Iraqis have grown accustomed to the atrocities committed by ISIS, the killing of the eight civilians shocked the nation and doused hopes the extremists had been defeated.
For the first time, the authorities released photographs of the hangings, which came after Mr Al Abadi on Thursday ordered the "immediate" executions of hundreds of convicted extremists on death row.
The justice ministry said the 13 convicts put to death at a prison in southern Iraq "had participated in armed operations with terrorist groups, in kidnappings, bombings and murders of civilians".
Mr Al Abadi's office had earlier announced the execution of 12 convicts whose appeals were exhausted.
More than 300 people, including about 100 foreign women, have been condemned to death in Iraq and hundreds of others to life imprisonment for membership of ISIS, a judicial source said in April.
Mr Al Abadi, who has faced charges of failing to respond in force to ISIS, ordered "the immediate punishment of terrorists condemned to death" whose appeals have been exhausted, his office said.
A photograph released by the justice ministry showed a group of blindfolded and handcuffed men sitting on the floor waiting to be executed.
Another showed several convicts being hanged at the prison in Nasiriyah.
Mr Al Abadi vowed to avenge the deaths of the eight civilians held captive by ISIS, a day after their bodies were found along a highway north of Baghdad.
"Our security and military forces will take forceful revenge against these terrorist cells," he told senior military officials and ministers.
"We promise that we will kill or arrest those who committed this crime."
Six of the abductees -- civilians working in the logistics department of the Hashed Al Shaabi paramilitary force that helped defeat ISIS -- had appeared in an ISIS video released on Saturday with badly bruised faces.
ISIS had threatened to execute their captives unless Baghdad released Sunni Muslim women held in its prisons.
Iraq declared victory over ISIS in December after expelling the extremist militants from all major towns and cities in a vast offensive.
But the Iraqi military has kept up operations targeting mostly remote desert areas from where militants have continued to carry out attacks.
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Iraq, which has repeatedly faced criticism over the high number of death sentences handed down by its anti-terrorist courts, hanged at least 111 convicts in 2017.
Around 20,000 people were arrested in the three-year battle by Iraqi forces to drive out ISIS, which had seized swathes of western and northern Iraq in 2014.
Human Rights Watch last week urged Iraq's judiciary to deal with foreign women and children affiliated with ISIS on a case-by-case basis instead of slapping them with "one size fits all" sentences.
Since January, HRW said Iraq's judiciary had "proceeded with rushed trials against foreigners on charges of illegal entry and membership in or assistance" to the extremist group.
Most foreign women had been sentenced to death or life in prison and children aged nine and above to between five and 15 years in jail for taking part in violent acts, it said.
