Police investigating the Millbank riot have released images of 13 protesters suspected of committing criminal offences.

The images were captured on CCTV cameras inside the office complex and on its roof as dozens of demonstrators stormed the building.

They were also filmed by officers stationed in the forecourt as more than a thousand people gathered outside the headquarters of the Tory party.

More than 50 people have been arrested after a mob ransacked 30 Millbank during a National Union of Students march against proposed rises in student tuition fees.

Windows were smashed, graffiti daubed on walls and missiles, including a fire extinguisher, were thrown from the seventh floor roof.

A four-hour stand-off ended when police brought in more than a hundred extra officers to clear the building and the road outside.

The Metropolitan Police has launched Operation Malone in a bid to trace those responsible for the violence and vandalism.

An 18-year-old man suspected of throwing the fire extinguisher, which narrowly missed two officers, was arrested in Southampton yesterday.

The man, the 58th to be arrested, was being questioned on suspicion of attempted murder today after being transferred to a London police station.

On Friday, a 23-year-old student from Anglia Ruskin University in Cambridge was arrested and then released on bail on suspicion of violent disorder.

An 18-year-old man was also arrested on suspicion of violent disorder when he attended Folkestone Police Station before being released on bail that day.

On Saturday, a 17-year-old boy was arrested on suspicion of violent disorder in London. He has since been bailed to a date in mid-February.

Police Federation representatives have called for the person who flung the empty metal fire extinguisher to be charged with attempted murder.

Anyone who recognises any of the suspects should call 0208 246 9386 or Crimestoppers, anonymously, on 0800 555 111.