A car thief attacked his accomplice in front of a packed court room, leaving him bloodied and with a black eye.
Sufiyan Mahmood attacked Faisal Khan as he was given seven years and 10 months for his crimes, according to Court News UK.
But Leila Gaskin, who defended Mahmood, claimed a senior prison officer had told her Khan attacked Mahmood en route to the courtroom the day before sentencing.
The pair stole more than 100 cars, with a total value of £2,694,205, and Mahmood blamed Khan for giving information to the police, the court heard.
They used specialist locksmith equipment in order to complete the thefts and were able to get past security systems on cars within seconds.
They also burgled homes to gain car keys. The cars they stole were often fitted with fake number plates and sold either in the UK or overseas.
Due to the incident in the courtroom, the judge said: "I think I ought to invite the Crown Prosecution Service to decide what action should be taken."
Mahmood admitted to one count of conspiracy to steal and one count of conspiracy to commit burglary, but he may now face further charges if his actions in court are dealt with as a criminal offence.
Khan was sentenced to four years for his role in the car thefts.