A 10-year-old girl and two adults were doused in acid in a 'random attack' by a stranger who knocked on their door.

Police, paramedics and fire crews rushed to Beaufort Park in Colindale at around 7.20pm yesterday (July 12) after reports of three people suffering injuries from a corrosive substance.

All three were rushed to hospital but their condition is not thought to be life-threatening.

A number of police officers were also treated at the scene, but none are in a serious condition according to the Metropolitan Police.

A 36-year-old woman and a 43-year-old man were also injured, as well as the little girl police said, with all three now discharged from hospital.

Shocked neighbours living in or near the apartment block Erwin House where the attack took place, said they believe three people were attacked after a “stranger” knocked on their door and threw the substance.

Footage has been shared on social media of police officers pouring bottles of water over their colleagues in the street in an apparent attempt to wash of the corrosive substance.

This morning, the floor outside two of the flats appeared to still have burn marks left by the corrosive liquid.

One nearby resident, Salwa Amrane, 30, described the aftermath of the attack as the emergency services rushed to the block.

She said: "I saw plenty of ambulances, not one or two, but three. I saw plenty of police - they were stopping people when they were trying to get the woman in the ambulance - half of her was burned when they were trying to put her in the ambulance."

Emergency services are no longer at the scene today, but a paper sign has been attacked to the door of Erwin House which reads: “Caution, wet floor acid spillage. Please deep clean.”

The hallway of the building is thick with a chemical smell, while the floor outside two ground floor flats – one of which is claimed to be the target of the attack – appeared so have been damaged by burns.

A large black mark can be seen on the floor while streaks of a liquid remain on the doorframe of one of the flats.

Times Series: The floor by the flat appears burnt (Photo:SWNS)The floor by the flat appears burnt (Photo:SWNS)

No arrests have been made and an investigation into the circumstances are ongoing, Scotland Yard said.

Appealing for anyone with information to come forward, Detective Sergeant Ewa Czura said this afternoon: "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."

Anyone with information can call police on 101, tweet @MetCC quoting CAD 6733/12July or contact independent charity Crimestoppers, anonymously on 0800 555 111.