A human rights group reported more than 2,000 people killed during a security-force crackdown on protests in Iran, and said more than 16,780 protesters had been arrested. Videos from Tehran showed people searching for bodies at the Kahrizak Forensic Centre, and doctors and residents described hospitals and cities affected by violence and fires. Donald Trump said he had cancelled meetings with Iranian officials, urged people to keep protesting, and said the US would take very strong action if Iranian authorities started hanging protesters. Iranian officials blamed “terrorists” and said foreign enemies and infiltrators were behind the unrest, while the UN human rights chief urged an immediate halt to violence and repression and warned about possible use of the death penalty through expedited trials.