At least five protesters died in Iran police custody, says Amnesty International

At least five protesters arrested during recent anti-government demonstrations in Iran have died in police custody, Amnesty International said on Tuesday.

A brutal crackdown by security forces led to at least 22 protesters but more deaths might have taken place in prison cells, where reports of torture are frequent, the human rights group claimed.

Amnesty International said one protester,

Sina Ghanbari, aged 23, died in mysterious circumstances at the "quarantine" section at Tehran's notorious Evin prison.

Authorities said Ghanbari committed suicide. Activists dispute this claim.

Amnesty International has called on Tehran to investigate his death and others following the crackdown on anti-government rallies in Iran.

"The shroud of secrecy and lack of transparency over what happened to these detainees is alarming. Instead of rushing to the judgment that they committed suicide, the authorities must immediately launch an independent, impartial, and transparent investigation, including independent autopsies," said Magdalena Mughrabi, Amnesty International's deputy director for the Middle East and North Africa.

"We have long documented the nightmarish conditions in detention facilities in Iran, including the use of torture. Those suspected of having any responsibility for these deaths should be suspended from their positions and prosecuted in proceedings that respect international fair trial standards and without recourse to the death penalty."

At least four other people have reportedly died in custody including two more at Evin prison's "quarantine" section, human rights lawyer Nasrin Sotoudeh reported.