"Sometimes mums do know best." The officer confirmed there had also been reports of anti-social behaviour in parks around Wednesfield, which involved the moped, earlier in the day.
In a statement the Metropolitan Police said: "Police were called at approximately 11.19am on Friday, 17 May to Glencoe Road in Yeading following reports that a moped rider had been assaulted and robbed of his vehicle.
The video, which is being shared widely on Facebook and Twitter, is filmed by a Mercedes driver who "smashed" his car into the moped rider he saw attacking a motorcyclist with a hammer.
He had insurance wouldn't pay didn't have ride the return flight His family said the 31-year-old desperately needed to be moved to a "more advanced" hospital but his travel insurer would not cover all the costs because he did not have a licence to ride the moped.
The emergency services were called to Beake Avenue near to the junction of Foster Road at around 8.20pm, following reports of a collision between a car and a moped.
The moped has been completely destroyed, while there is extensive damage to the Mini Cooper parked behind it and to the rear of the car parked in front of it.
However, footage released by the police showed examples of a police car moving up to a fast-fleeing moped, hitting it with its front bumper and sending the driver and his machine sprawling.The Metropolitan Police said no maximum speed was imposed in the pursuit of criminals on mopeds.
Commander Amanda Pearson, of the Metropolitan Police's frontline policing unit, said it was a common misconception among moped thieves that officers will end their pursuit if the suspect drives dangerously or removes their helmet.