Three Metropolitan Police officers involved in the stop and search of Team GB sprinter Bianca Williams are now being investigated for potential gross misconduct over equality and diversity issues, it has emerged.
The athlete and her boyfriend, fellow sprinter, Ricardo Dos Santos, were stopped by police as they drove through Maida Vale in west London with their baby last July.
They were handcuffed and searched after the officers claimed their Mercedes car was being driven in a suspicious manner.
A video of the incident was released online and sparked a fierce debate over the use of stop and search against members of the Black community.
Dame Cressida Dick, the Met Commissioner, later apologised for any distress caused, with the Met initially insisting there was no misconduct on behalf of the officers.
But the matter was referred to the Independent Office for Police Conduct (IOPC) after Miss Williams accused the force of racial profiling.
Six officers were placed under investigation over claims that they had failed to be courteous and respectful and concerns over the use of force.
But three of those are now facing a potential gross misconduct charge after the watchdog said new evidence had come to light relating to matters of equality and diversity.
If found guilty of gross misconduct they could be dismissed from the force.
The IOPC is investigating six Scotland Yard officers
A spokesman for the IOPC said: "Three MPS officers are now subject to a gross misconduct investigation for potential breaches of police standards of professional behaviour.
"The three officers were already subject to a misconduct investigation for various potential breaches of police standards of professional behaviour relating to the use of force; duties and responsibilities; and authority, respect and courtesy.
"After reviewing a range of new evidence, they were informed they are now subject to an investigation for potential breaches of the police standards of professional behaviour relating to equality and diversity, which requires officers to act with fairness and impartiality and not to discriminate unlawfully or unfairly."
Two of those officers are also being investigated over potential breaches of standards relating to honesty and integrity.
Three other officers are also being investigated over less serious allegations relating to the stop and search.
The IOPC spokesman added: "Our investigatory work has now concluded and preparation of the final report is under way."
The two athletes are understood to have pushed for the investigation to be upgraded to one of gross misconduct.
Their solicitor, Jules Carey, said: “The IOPC have taken a year to upgrade the investigation to an investigation in racism and dishonesty. I have huge admiration for my client’s resilience and patience.”
A spokesman for the Met said all the officers remained on normal duties: “We are aware three MPS officers are subject to a gross misconduct investigation by the IOPC in relation to this matter.
"Another three officers are being investigated for misconduct for potential breaches of standards of professional standards. The MPS continues to fully cooperate with the IOPC investigation.
“No officer is suspended or subject to restricted duties.”