Two BMW racers were "showing off" to each other when one of them mowed down and killed a young woman as she crossed the road, a court has heard.

Farid Reza, 36, and William Spicer, 28, were allegedly going at more than twice the 30mph speed limit before the crash which left 21-year-old student Hina Shamim dead.

The pair have gone on trial at the Old Bailey charged with causing death by dangerous driving on March 31 2015.

They are also accused of causing injury to one of five children in the back of one of the vehicles involved in the collision in Kingston-upon-Thames, London.

Prosecutor Deanna Heer told jurors: "Hina Shamim, who was 21 years old, was struck by a white BMW as she was crossing the road and killed instantly.

"Having collided with her, the BMW crashed into a bus before coming to rest on the pavement."

A young child, who cannot be identified, suffered a fractured skull, jaw and collarbone in the collision, jurors were told.

Reza was behind the wheel of the white BMW which was racing a dark grey BMW driven by Spicer accompanied by three university friends, Ms Heer said.

Both are "high-performance" cars capable of going from 0-60mph in less than six seconds with top speeds of 155mph, she said.

The lawyer told jurors: "The prosecution case is that the defendants were showing off to one another therefore encouraging one another to drive in a dangerous manner."

Penrhyn Road, in Kingston-upon-Thames, where the crash happened, has a speed limit of 30mph and is a single carriageway.

But both BMWs were doing about 69mph - more than twice the speed limit - at the time of the crash, jurors were told.

Reza, of Kingston-upon-Thames, and Spicer, of Harrow, north-west London, deny the charges against them.

The crash happened just before 9pm near Kingston University where Ms Shamim was studying for a degree in sports science.

The victim, who lived nearby, was on her way to the university library when the defendants sped down the road heading towards Surbiton, jurors were told.

Reza had just stopped off in his BMW M3 to pick up a takeaway menu en route home while Spicer, a Kingston University student, was heading towards a Pizza Hut restaurant for dinner driving a BMW 330d.

The cars were identified in CCTV footage jumping a red light along the route before the crash, the court heard.

One witness later described the cars going "really fast" before the white BMW crashed. The other car allegedly carried on without stopping.

The only passenger on a 418 double decker bus saw Ms Shamim get hit by the white BMW and go over the bonnet, hitting her head on the windscreen, jurors were told.

The car went on to crash into the bus before spinning and eventually coming to rest on the pavement. Ms Shamim was pronounced dead at the scene.

Afterwards, Reza was allegedly heard to say: "I didn't mean to hit her, she just stepped out."

The court heard that there were five children in Reza's car, so at least two of them would not have been wearing seat belts.

The youngsters were left in tears and screaming, while the front seat passenger, who was trapped in the wreckage, was "shaking profusely" with shock.

Spicer was driving a hire car provided by an insurance company following an unrelated claim.

The jury was told that if Reza had been travelling at the speed limit, he would have been able to stop with three metres to spare.

But Ms Heer said: "At the speed he was travelling along Penryhn Road that night there was no way he could stop before impact. In other words, Hina Shamim didn't stand a chance."

In a police interview, Spicer denied "racing" or "showing off" and claimed he had been driving "pretty decently".

He told officers he recognised the other BMW driver as the owner of a computer shop.

Spicer allegedly said he had passed by the accident in "shock" then parked up and walked back, only to be moved away from the scene by police.

Ms Heer said the defendants both knew the area and that there were likely to be pedestrians about near the university campus.

She told jurors: "Driving at a speed of 69mph in that environment was of itself dangerous.

"The more so if, as the evidence suggests, they were competing with each other and racing with each other and showing off."

The trial continues.