Story highlights Hassan Afshar was hanged at Iran's Arak prison on July 18, Amnesty International says

Rights group says it was first confirmed execution of juvenile offender in Iran this year

(CNN) A teenager convicted of raping a boy in Iran was hanged in what an Amnesty International official called proof of the country's "sickening enthusiasm" for putting juvenile offenders to death.

The July 18 hanging of Hassan Afshar, 19, at Arak prison in Markazi Province was the first confirmed execution of a juvenile offender in the country this year, Amnesty International said.

CNN has sought comment from Iranian officials.

Afshar was a 17-year-old high school student when he was arrested in December 2014 after being accused with two other youths of forcing a teenage boy to have sexual intercourse, according to the rights group.

Afshar, who maintained the sexual acts were consensual, was convicted last year of "lavat-e be onf," or forced male-to-male anal intercourse.

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