New Delhi, Aug. 2 -- Iran has executed a 20-year-old protester arrested during the country's January anti-government demonstrations, according to Iran International, a UK-based news outlet, prompting renewed concerns over the fate of several other detainees facing death sentences.

According to the report, Arvin Kheirkhah was executed at Shahroud prison on Saturday after being convicted by a Revolutionary Court on charges of moharebeh, or "waging war against God". He had been transferred to solitary confinement on Wednesday ahead of the execution.

Iran International reported that Kheirkhah's family gathered outside Shahroud prison on Friday night in an attempt to stop the execution.

Citing information it obtained, the outlet said Kheirk...