"However, I would continue to encourage anyone with information about the current whereabouts of these two men to contact either the police or Crimestoppers in confidence, as soon as possible".
At least one of the subsequent attacks involved a razor blade, with an inmate slashed across his face and back.
The Metropolitan Police have since named the two men as convicted attempted murderer Matthew Baker, 28, and James Anthony Whitlock, 31, who was on remand charged with conspiracy to burgle.
Police urged the public not to approach either man as "they could become violent".
Det Ch Insp Steve Heatley said: "We have received a positive response to our appeals and the flow of information from the public so far has been very good".
It is not known what clothing either man had when escaping from the prison.
"Anyone helping is potentially committing a crime. We are working closely with the police and are urgently investigating this matter".
A spokesperson said officers attended and established with prison staff that two male prisoners, aged 28 and 31, had escaped from prison and enquiries are ongoing to locate them.
However, Steve Gillan, general secretary of the union the Prison Officers Association, said the focus should fall on the Government rather than officers at the north London jail.
These images show the squalid state of Pentonville prison.
"The basics of security aren't getting done simply because there are not enough staff to deal with the daily tasks". He was due to be sentenced on 11 November.
The two men remain at large after reportedly using diamond-tipped cutting equipment to break through cell bars in an audacious escape. "They are assuming that it was probably bed sheets and it was at night".
In a prisons inspectorate report in June a year ago, then-prison inspector Nick Hardwick said of Pentonville: "Most prisoners felt unsafe; levels of violence were much higher than in similar prisons, and had nearly doubled since the last inspection".