Police have dispersed the final student demonstrators in central London after a day of protests against higher
tuition fees and university cuts.
Police said 17 people were injured, including two officers as protesters were contained on Whitehall.
There have also been occupations in at least 12 universities, including Oxford University's Bodleian Library.
School pupils walked out of lessons to join university and college students on local protest marches across the UK.
As darkness fell, fires were started, graffiti sprayed and windows broken in Whitehall by demonstrators who were being contained by police.
Hundreds of remaining protesters were gradually released by police throughout the evening.
Earlier a police van was attacked and barricades thrown as protesters tried to break through police lines.
Buses attacked
There were 32 arrests - mainly for public order offences and criminal damage, according to the Metropolitan Police.
Among the 17 people injured, the two officers and 11 members of the public were treated in hospital for minor injuries. No-one was seriously injured.
Transport for London (TfL) also reported that protesters had thrown missiles at buses in central London, smashing windows and causing many routes to be diverted away from the Whitehall and Trafalgar Square area.
Broken windows were reported on two routes, although no injuries were sustained.
A spokeswoman for TfL said: "We're still trying to assess the full extent of the damage from today's demonstrations.
"We know that bus shelters and ticket machines along Whitehall have been severely damaged and we're checking to see what other damage has been caused. As the protest moved on during the day we had to put in place rolling diversions to keep buses away from it."
The prime minister's spokesman said: "People have a right to engage in lawful and peaceful protest, but there is no place for violence or intimidation."