The woman who died after being hit by a police car on a 999 call was a 26-year-old refugee from Eritrea.
The Metropolitan Police said the collision with the marked police car happened in Forest Road, east London, on Tuesday night.
The woman was a refugee from Eritrea who had been living at YMCA Walthamstow for the last 18 months, YMCA St Paul’s Group have said.
The car had been responding to a call about a man threatening members of the public in Walthamstow.
A YMCA spokesman said: ‘The YMCA St Paul’s Group is shocked and saddened by this news and wishes to extend its condolences to the family and friends of the resident.
‘YMCA Walthamstow is supporting its residents and staff with counselling. Flowers have been laid at the site of the incident on Forest Road today by residents and staff, led by the YMCA chaplaincy team.’
The organisation serves young people and communities across London and beyond. YMCA Walthamstow provides hostel accommodation across South West, West, South and East London, as well as for some single homeless individuals.
The Met confirmed the man had left the premises before they arrived.
A police spokesman said the car stopped at the scene and the officers tried to help the woman before medics arrived but she was pronounced dead at the scene.
Images and video posted to social media just after midnight show at least five police cars and two ambulances near the pedestrian crossing by Waltham Forest Council.
Officers can be seen performing CPR in one video, before being joined by paramedics in later footage.
A third video shows officers holding a blanket to shield the scene from public view.
Police are trying to trace the victim’s next of kin, who are believed to be outside the UK.
The Met’s internal Directorate of Professional Standards has been informed, as has the Independent Office for Police Conduct watchdog.