Police are trying to trace a passer-by who helped police arrest a suspect after a chase in a busy town centre on Christmas Eve.
The woman tripped up the man police were pursuing in Hertford.
The man fell over allowing the police officers to catch up and arrest him.
Police in Hertfordshire have released CCTV footage of the incident in the hope of tracking down the quick-thinking passer-by to thank her for helping out.
The incident happened just after 10.30pm on Christmas Eve when neighbourhood police officers were alerted to a group of men who had allegedly threatened a member of door staff at a venue in Hertford town centre.
Shortly after, the officers stopped a vehicle before one of the men inside made off.
A police constable gave chase and attempted to detain the suspect, who allegedly pushed her as he tried to get away.
- A man has been charged has been charged with possession of cocaine, assault on a police constable and being drunk and disorderly. He will appear in court in January.