Kent Police said Murray must serve 10 years in jail in Morocco for his involvement.
Kent Police later apologised for the incident.
Neighbourhood Officers hold frequent consultations with residents and Kent Police.
Two years ago, Kent Police investigated after a handwritten sign claiming to name the killer was found next to a plaque in memory of the teenager.
It is initiated and implemented by Kent Police, when there is disruption to cross channel travel.
Essex Police and Kent Police have responsibilities on the parts of the river downstream outside the metropolitan area.
Kent Police confirmed Murray's arrest the next day, and also stated that over 30 people had now been arrested in conjunction with the investigation.
The first PSV scheme was started in 1992 by Kent Police.
The car driver, a 20-year-old man, had ignored or failed to see warning lights; he was arrested at the scene, and later bailed by Kent Police.
Nigel Shamber, duty inspector at Kent Police, said the incident was "just routine".