Two prisoners who fooled jailed staff by placing dummies on their beds remain on the run after escaping from Pentonville prison in north London, according to a Sky news report.
It is believed the pair used diamond-tipped cutting equipment to break through cell bars before scaling the perimeter wall.
A manhunt is now underway for James Whitlock, aged 31, and 28-year-old Matthew Baker.
Police have warned the public not to approach the two convicts as they could become violent, but to call 999 if they see either of them.
Baker was on remand awaiting sentencing after being found guilty two weeks ago of the attempted murder of a man at a flat in Dagenham.
He was due to be sentenced on Friday.
Whitlock, who has the word ‘Tracy’ tattooed on his body, was also on remand after being charged with conspiracy to burgle more than 19 ATMs between December 2015 and August 2016.
Mike Rolfe, from the Prison Officers’ Association, told Sky News the escapees would have had help from outside, and equipment may have been sent in by drone.
The Metropolitan Police said it was called to Pentonville in Islington at 11.44am on Monday.
A spokeswoman from the Prison Service said: “Public protection is our top priority and we take escapes from custody extremely seriously.
“We are working closely with the police and are urgently investigating the matter.”