Human rights campaigners on Thursday paid tribute to an Iranian activist who killed himself hours after warning he would do so if four inmates seen to be political prisoners were not freed. Kianoosh Sanjari, an opponent of the Iranian clerical authorities, warned in a on X late Wednesday that he would die by suicide if the release of the two men and two women did not take place. He then took his own life, according to multiple rights campaigners and organisations. The formal announcement of his death, which is swiftly published by families in Iran when a relative dies, was also widely shared on social media. Sanjari had demanded the release of veteran campaigner Fatemeh Sepehri, Nasreen Shakarami, the mother of a teenager killed during 2022 protests, rapper Tomaj Salehi and civil rights activist Arsham Rezaei. “If they are not released from prison by 7:00pm today, Wednesday, and the news of their release is not published on the judiciary news site, I will end my life in protest against the dictatorship of (supreme leader Ayatollah Ali) Khamenei and his accomplices,” he said. He later added: “No one should be imprisoned for expressing their opinions. Protest is the right of every Iranian citizen.” “My life will end after this tweet but let’s not forget that we die and die for the love of life, not death,” he added. It was not immediately clear how he killed himself. Sanjari had late Wednesday an image that appeared to have been taken looking down on the street from the upper floor of a Tehran tower block. Figures from across the opposition spectrum expressed grief, saying the suicide was indicative of the climate in Iran due to the that followed the 2022-2023 nationwide which shook the authorities. Activists said Senjari had been repeatedly arrested and summoned in Iran since returning to take care of his elderly mother in 2015 after a stint working in the US for Voice of America. “His death is a warning to all of us of how heavy the price of silence and indifference can be,” said campaigner Arash Sadeghi, who endured a lengthy spell in jail during the protests. Atena Daemi, a labour activist released from jail in 2022, said on X that the Iranian government was responsible for driving the man to suicide, saying that it killed him “bit by bit […].” The US-based son of the ousted shah, Reza Pahlavi, said: “Our fight is for life against the regime of death and execution.” British actor of Iranian origin Nazanin Boniadi said the chorus of tributes was in stark contrast to the arguments that often mark exchanges in Iranian opposition circles. Iranian officials have not commented on the development.