Police Sergeant Andy Bell, of Bournemouth CID, said: “We know that a number of people where at the location at that time and we believe that some of them recorded footage of the incident on their phones. I urge those witnesses to contact Dorset Police urgently to make these recordings available to us.
“I am appealing for witnesses to the collision and anyone with information about the man responsible to come forward and contact police.
“I would also like to hear from anyone who witnessed the manner of driving of the BMW before and after the incident.”
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident number 24:83. Alternatively, call the free and anonymous Crimestoppers line on 0800 555 111 where mobile phone tariffs may apply.