Mohammad Amin Biglari was 19 years old. He worked at a hair salon and an internet store. He was taking music lessons and saving money to buy a computer. On a January night in Tehran, he was walking home from work when he was swept up by paramilitary forces near a protest and dragged into their base.

His father searched morgues for a month. When he finally learned his son was alive, he was given one-minute phone calls. On the fourth call, Biglari sobbed and told his father he had been sentenced to death. His lawyer was never allowed to review the case or present a defense.

On April 5, Mohammad Amin Biglari was hanged. Iranian authorities refused to return his body or tell his family where he was buried.

He is one of at least 28 people executed in Iran since mid-March — 13 of them arrested in connection with the January anti-government protests, according to Iran Human Rights, a Norway-based monitoring group. At least 4,000 more people have been arrested on national security charges since late February. The United Nations has documented forced disappearances, torture, coerced confessions, mock executions, and televised confessions extracted under duress.

Nobel Peace Prize laureate Narges Mohammadi, 54, suffered a heart attack in prison after being denied medical care. Amnesty International said her life was at risk. She has only recently been transferred to a hospital after days of desperate pleas from her family.

"Authorities have escalated their use of the death penalty as a tool of political repression," said Raha Bahreini of Amnesty International. "It's really unfathomable that as people were being bombed, they were also waking up almost daily to news of hangings."

The international community cannot look away. Sign this petition to demand that President Trump and Iranian authorities immediately halt all executions of protesters and political prisoners, release those detained for peacefully expressing dissent, and allow independent monitors access to its prisons.