(CNN) -- When Sina Ghanbari took to Tehran's streets during nationwide demonstrations at the beginning of 2018, he was speaking out against corruption, a sluggish economy and soaring fuel and food prices.
Ghanbari was detained during the protests. After being held in the so-called quarantine ward of Tehran's Evin prison for five days, he died on his 22nd birthday.
Prison authorities told his mother, Fatemeh Malayan Nejad, that her son had taken his own life. "My son called me fro
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