NEW: Champion wrestler Saleh Mohammadi, 19, was executed by Iran in a public hanging
Mohammadi, Mehdi Ghasemi, and Saeed Davoudi were executed as part of a crackdown on protests
Human rights groups said Mohammadi was tortured into confessing “to the capital charge of waging war against God.”
"His execution was a blatant political murder, part of the Islamic Republic’s pattern of targeting athletes to crush dissent and terrorize society," said human rights activist Nima Far
Authorities accused the protesters of killing two police officers with knives and swords
Amnesty International said the case was fast-tracked and did not resemble a meaningful trial