A police officer has been disciplined after he was accused of reportedly speeding at up to 140mph while transporting a prisoner who later complained.
The Durham Police officer was taking a prisoner from Leeds to Darlington in a marked BMW and allegedly broke the speed limit.
According to a report in the Northern Echo newspaper, the pair chatted about the powerful motor and the driver was asked how fast it could go.
The officer was said to have replied "I'll show you" or "Let's see" and accelerated away, reaching up to 140mph, the newspaper said.
Upon arrival at Darlington police station, the prisoner told the officer at the custody desk how fast they had been going.
Supt Darren Ellis, head of professional standards and legal services, said: "We are aware of this complaint which concerns an allegation of a marked police vehicle being driven at an excess and inappropriate speed whilst transporting a prisoner back from Leeds into our force area.
"There were no other reports from members of the public reporting the police vehicle being driven at high speed, or dangerously.
"The force has taken this allegation very seriously, the PC in question has been moved permanently from roads policing duties, has been handed a formal sanction under the Police Misconduct Procedures and is subject to an action plan concerning risk management and decision making.
"His licence has been suspended including any pursuit capability, he will have to go through a driving school reassessment before returning to full operational duties."