A teenage schoolgirl has been questioned over a mob attack on a police van during protests against proposals to increase student tuition fees.
The 16-year-old, from Beckenham, in south east London, was arrested by a Scotland Yard unit investigating the disorder.
She was questioned on suspicion of violent disorder and criminal damage in Whitehall, central London, on November 24.
The suspect was the 52nd person to be arrested over violent clashes and vandalism in the capital in the second of a series of demonstrations.
Of these, 51 have been bailed pending further inquiries and one person charged with being drunk and disorderly.
Senior officers have set up a specialist team to identify those responsible for violence and other criminal acts during student fee protests.
Police have arrested more than 180 people, studied hours of CCTV footage and issued mugshots of dozens of suspects.
Images of the abandoned police van being smashed up, covered in graffiti and looted were beamed around the world.
A Metropolitan Police spokesman said the 16-year-old girl has been released on bail until June.