Scotland Yard said its officers had responded to an altercation between two groups of men inside Stratford Shopping Centre in east London last evening during which a "noxious substance" was thrown.
When the liquid was thrown, both groups ran from the scene and were later treated for "non-life threatening and non-life changing injuries".
As the injuries were in a number of different locations, there were initial fears that people had been sprayed at random.
"I recognise the lasting impact on victims of corrosive substance attacks. Our response to such attacks is continually improving through training and joint working with partners and we are working with the Home Office to explore possible restrictions around the sale of corrosive substances in conjunction with retailers and manufacturers."
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An assistant manager at Burger King in the area said one of the victims had run into the fast food chain to "wash acid off his face".
Paul Gibson, Assistant Director of Operations at London Ambulance Service, said: We sent a number of resources including ambulance crews, paramedics in cars and members of our hazardous area response team.
"The first of our medics arrived within 10 minutes of the first emergency call and worked closely with our colleagues from the Metropolitan Police, British Transport Police and London Fire Brigade making sure patients received the medical help they needed as quickly as possible.
The Hazardous Area Response Team is a group of specially trained ambulance crews who provide life-saving medical care in hostile environments.
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