Two teenagers have been arrested on suspicion of violent disorder relating to student protests in central London 10 days ago.
A 17-year-old male student and an 18-year-old woman, who was also arrested on suspicion of assault on police officers, were later released on bail.
He attended Stourbridge police station in the West Midlands and she was taken to a south London police station.
A total of 64 people have now been held after rioting at the Tory party HQ.
The 18-year-old woman has been bailed to return on a date in February.
The Met Police launched Operation Malone to find those responsible for the violence and vandalism at the building in Millbank.
Images of 13 protesters suspected of committing criminal offences were released by police on Wednesday.
The images were captured on CCTV cameras inside the office complex and on its roof as dozens of demonstrators stormed the building.
Dozens of people were hurt when 2,000 protesters split from the march to surround the Conservative HQ, where windows were smashed, fires lit, missiles hurled at police and graffiti daubed on the walls during the four-hour stand-off.
It had begun as a peaceful protest attended by an estimated 25,000 people, angry at government plans to allow universities to charge up to £9,000 per year in tuition fees.