Police have confirmed that the matter has been referred to the Independent Police Complaints Commission.
It is understood this relates to the fact that police were in pursuit of a car before the fatal collision.
More top news
The 17-year-old, who cannot be named for legal reasons, must pay the billionaire £100 after sending a series of anti-semitic tweets.
Andrew Taylor and Timmy Donovan set upon PC Neil Doyle after spotting him on a Christmas night out.
Hundreds of people have been forced to evacuate their homes in northern California as wildfires ripped through dry brush and scrub oak.