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

US secretary of state slams Tehran for using 'violence' and censorship against its citizens following anti-government demonstrations

Tehran disrupts international connections ahead of commemorations for those killed demonstrating over fuel price hike

Supreme Leader Khamenei gave green light to security services to use any force necessary to stop the demonstrations, Reuters reports

Rights aficionados believe thousands still being held after deadly crackdown on mass protests, say Iranian security forces 'were aiming to kill or at least cause serious injury'