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
Scotland will become the first part of the UK to ban smacking if the bill goes through.
Jeremy Corbyn has arrived in Brussels to "ensure negotiations get on track" as he accused Theresa May of "upsetting just about everybody".
The rising cost of clearing up a record number of illegally dumped items - which ranged from fridges animal carcasses - has been revealed.