Dai Davies, the former head of royal protection for the Metropolitan Police, says accidents like these are embarrassing for the service, but that training for officers is very rigorous.
The Metropolitan Police Service says a royal protection officer who accidentally fired a gun while it's believed they were guarding the Duke and Duchess of Cambridge's home on Anglesey has been taken off firearms duty while the incident is investigated.
– Metropolitan Police Service spokesman
Shortly before 1pm on Wednesday October 24 an on-duty MPS police officer unintentionally discharged a firearm while in an unmarked police vehicle.
The round damaged the floor of the vehicle. Another on-duty officer was in the vehicle at the time of the incident. Neither officer was injured.
The officers were on duty in north Wales at the time.
A Scotland Yard investigation's underway after a policeman thought to be guarding the North Wales home of The Duke and Duchess of Cambridge accidentally fired a gun while sitting in an unmarked car. Nobody was injured in the incident, which happened last week.
Prince William, or Flight Lieutenant Wales as he's known as an RAF search and rescue helicopter pilot, captains Sea King helicopters from his unit's base at RAF Valley on Anglesey.