The police were called to Stratford Centre at 8 p.m. on Saturday following an "altercation" between two groups of males where a noxious substance was thrown, reports the BBC.
The injuries were "not life threatening or life changing", the London Ambulance Service said.
Out of the six injured, three were taken to a hospital.
A 15-year-old boy has been arrested on suspicion of grievous bodily harm.
Those reported injured were believed to be in a number of different locations, sparking initial fears that people had been sprayed at random.
A Met Police official said: "I would like to be very clear concerning this incident.
"What initially may have been perceived as a number of random attacks has, on closer inspection, been found to be one incident involving two groups of males.
"This incident is not being treated as terror-related."
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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