A 25-year-old woman has died after she was hit by a police car on Boxing Day.
The vehicle was "attending an incident" when the collision took place at around 11.30pm on Dalston Lane, Hackney, east London.
The woman suffered life-threatening injuries and was taken to hospital, where she died on Friday, the Independent Police Complaints Commission (IPCC) said.
A spokesman said: "The IPCC has launched an independent investigation following a collision between a police car and a pedestrian on Dalston Lane, Hackney, at about 11.30pm, December 26.
"The incident was mandatorily referred to the IPCC by the Metropolitan Police and an independent investigation was launched on the morning of 27 December. IPCC staff attended post incident procedures."
Videos posted to social media appear to show the woman being treated on the road by paramedics after the crash.
A witness who filmed the aftermath of the collision wrote the victim was being treated in Amhurst Road and Dalston Lane.
One video shows officers standing at the cordoned-off scene as paramedics appear to be treating someone on a stretcher.
Another clip shows multiple flashing police vehicles and buses at a standstill at a busy junction while officers patrol the scene.