Detectives identified a sex attacker by trawling through CCTV images.
Khalid Abdullah, 35, of Towler Street in Peterborough, was today jailed for eight years.
The Sudanese national had threatened his victim with a weapon before dragging her to an alleyway where he pushed her against a building and tried to rape her.
He then apologised and offered the woman his mobile phone to call police before she escaped.
More top news
Armed police patrol the region's biggest Christmas market in response to the heightened nation terror threat.
Sister Laura and Philippa from Bury St Edmunds have beaten the odds by giving birth to their babies on the same day
A man student from Luton who told an undercover police officer he was willing to use a suicide vest has been detained for six years.