Police Scotland said they were “subjected to unprecedented levels of violence” by a minority of people on Bonfire Night in Edinburgh and Glasgow.
Eight police officers sustained minor injuries after a number of incidents with petrol bombs, fireworks and projectiles that required a response from specialist police.
Around 100 youths gathered on Hay Avenue in Niddrie, Edinburgh, just before 5pm on Sunday in a repeat of disorder seen last year in the neighbourhood.
Drone footage showed people aiming fireworks and petrol bombs at riot police in Edinburgh.
Police say around 50 of them were responsible for directing fireworks, petrol bombs and other projectiles at buildings, vehicles and police.
Assistant Chief Constable Tim Mairs said while the majority of Scotland enjoyed Bonfire Night, “Police Scotland officers were subjected to unprecedented levels of violence.
“A minority of individuals have been responsible for an unacceptable and frankly, disgusting level of disorder that left communities alarmed and police officers injured.
“The violent nature of the situation witnessed in the Niddrie area of Edinburgh is extremely concerning, not least because it is believed young people were being actively encouraged and co-ordinated by adults to target officers while they carried out their duties.”
Drone footage showed a line of police officers with riot shields standing in front of vans with blue lights flashing.
A mob of black-clad youths gathered on grass in front of them and began throwing pyrotechnics.
The police made a retreat as a petrol bomb hit the ground in front of them and fireworks exploded.
The assault continued, with petrol bombs and fireworks forcing police to shuffle backwards.
The officers then ran at the assailants, in footage filmed from a nearby sports centre.
Police Scotland said there were a small number of arrests made with further arrests anticipated to follow in the coming days as investigations continue.
In Dundee, two police vehicles were struck by bricks, while in Glasgow two groups of youths were fighting and directing fireworks towards each other.
Last year in Niddrie, motorbike gangs terrorised the neighbourhood on Bonfire Night while fireworks were thrown on the ground.
In 2018, Police Scotland set up Operation Moonbeam to tackle Bonfire Night chaos, and on Tuesday, riot police attended Kirkton, Dundee, after children reportedly as young as 10 set off fireworks.
Scottish Conservative justice spokesman Russell Findlay branded the youths in Edinburgh “thugs”, and council leader Cammy Day warned they would be prosecuted.
Mr Day said: “I’m appalled to see the scenes in Niddrie this evening. We’ve been clear that this sort of conduct is unacceptable.
“We’ve been working throughout the year in our communities to mitigate Bonfire Night-related disruption so it is extremely disappointing to see a minority of people behaving in this way.
“This reckless behaviour endangers lives and, like the majority, I share in their dismay and upset at this disgraceful behaviour.”
Mr Findlay said: “Such attacks on police officers are cowardly, reckless and dangerous. Police Scotland need sufficient resources to tackle these thugs.”
