Detectives investigating an incident in Colindale in which a corrosive substance was thrown at three victims are appealing for information from the public.
Police were called at approximately 19:20hrs on Monday, 12 July to reports of the incident at an address in NW9.
A 43-year-old man, 36-year-old woman and 10-year-old girl were injured after a corrosive substance was thrown at them.
All three were taken to hospital by London Ambulance Service where they were treated for non-life-threatening injuries. They have since been discharged.
A number of officers were also treated at the scene for the effects of the substance after attending the address. None of their conditions were serious.
No arrests have been made and enquiries into the circumstances are ongoing.
Detective Sergeant Ewa Czura said: "It is vital that we identify the suspect responsible for this attack and we need the public's help. If you were in the area and witnessed the incident or have any information that could assist, I urge you to come forward and speak to police. The information you have might be essential to our investigation and help to bring justice to the victims and their family."
Please call police on 101 or tweet @MetCC quoting CAD 6733/12July or contact independent charity Crimestoppers, anonymously on 0800 555 111.