Things changing fast in Iran.
What happened at the protests?
Students gathered outside at least two universities, Sharif and Amir Kabir, reports said, initially to pay respect to the victims. Protests turned angry in the evening.
The semi-official Fars news agency carried a rare report of the unrest, saying up to 1,000 people had chanted slogans against leaders and tore up pictures of Soleimani.
The students called for those responsible for the downing the plane, and those they said had covered up the action, to be prosecuted.
Chants included "commander-in-chief resign", referring to Supreme Leader Ali Khamenei, and "death to liars".
Fars said police had "dispersed" the protesters, who were blocking roads. Social media footage appeared to show tear gas being fired.
And a hair-raising encounter for the British Ambassador
The UK ambassador to Iran was arrested during anti-government protests in Tehran after officials admitted shooting down a passenger plane.
Rob Macaire was held for three hours, in what the UK described as a "flagrant violation of international law".
It is understood he was attending a vigil for those who died in the crash, which turned into a protest.
He left to make his way back to the UK embassy, but was arrested as he stopped at a barber shop for a haircut.