An "extremely dangerous" prisoner is being hunted by police after a clerical error meant he was released from jail months into a nine-year sentence.

Ralston Dodd, 25, was jailed in November after he admitted stabbing a man three times in the back following an argument on a north London street.

The attack, described as an "appalling act of violence" by police, left the victim fighting for his life and an extensive manhunt was launched to track Dodd down.

Now police have been forced to launch a second search for the violent offender, after he was released from prison in error as a result of a court incorrectly recording his sentence.