Police have arrested a 14-year-old boy over the throwing of a petrol bomb during a student protest.
The arrest came a day after Scotland Yard released images of a hooded figure running across Parliament Square and throwing a flaming bottle across a crowd of protesters.
A Metropolitan Police spokesman said: "Police have arrested a 14-year-old boy in connection with the throwing of a flaming object in Parliament Square during the student protest of December 9, 2010. The boy is being questioned in a south London police station."
The video images were recorded by a member of the public during one of the most violent days of demonstrations.
Investigators have also obtained images of a second suspect attacking cars in a royal convoy in Regent Street on the same day.
He was also caught on camera kicking in the windows of a branch of Topshop in Oxford Circus and throwing a metal fence at police officers.
On Thursday, detectives released a further 10 still images of people suspected of violence and other offences on November 24.
Senior officers at the Met have formed a specialist unit, dubbed Operation Malone, to bring those who broke the law to justice. They have arrested more than 200 suspects, the majority in their late teens and early 20s, since the first protest on November 10.
The latest arrest follows the imprisonment of Hampshire student Edward Woollard for throwing a fire extinguisher from the roof of the Millbank complex which houses Tory Party headquarters. The 18-year-old was jailed for 32 months after admitting violent disorder during the first outbreak of student protest disorder.
Anybody with information is asked to call 020 8358 0100 or Crimestoppers, anonymously, on 0800 555 111.
