Twenty convicts were executed on Tuesday in a mass hanging in western Iran, local media reported on Thursday.
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The men, described as members of a Sunni terrorist and criminal group in Kurdistan Province, had killed dozens of people, including women and children, the Justice Bureau in Kurdistan said.
They were also accused of attacks on police stations which had killed several officers.
Earlier this year in April, Iran came under scrutiny after a scathing UN report, which highlighted what it called the "alarmingly high" rate of executions in the Islamic republic, including juveniles.
That report, along with an Amnesty International report in January, spurred commentary from ordinary Iranians on social media, at least some of which criticized President Hassan Rohani for not doing more to stop the juvenile executions.