'I couldn’t care less if they negotiate. Will be totally up to them but, no nuclear weapons and don’t kill your protesters,' president tweets in English and Persian

Videos show men with guns on the streets, bleeding demonstrators on sidewalks, police in riot gear beating people and dissidents ripping down and defacing posters of slain general

Social media posts show hundreds at fresh gatherings against leadership; pro-regime rally outside UK embassy demands its closure over arrest of ambassador

Tehran fears mass demonstrations after its Revolutionary Guard belatedly admits it accidentally shot down passenger jet

London expresses outrage after Rob Macaire was detained at vigil for 176 plane passengers killed by Iranian missile, says he left when anti-government chants began

PM says he supports demonstrators: 'They deserve freedom, liberty and the ability to live in security and peace, all of which the regime denies them'

Local media reports envoy freed after several hours; unconfirmed reports of internet shutdown in the Islamic Republic as public expresses outrage at shoot-down of passenger plane

Crowds call for supreme leader to resign as anger mounts over government's conduct; police said to use force to quell demonstration

Officials repeatedly denied notion missile struck jet though general says he notified leaders Wednesday; Tehran's failure to close airspace during peak tensions also scrutinized

Head of aerospace force takes 'full responsibility' for Iran's downing of plane that killed 176, says missile operator acted alone because of communications 'jamming'