London Police rushed to nearby Stratford tube station after a group of men sprayed acid into a crowd near the Stratford Shopping Center.
One man was arrested.
In a statement, the Metropolitan Police said, "Police were called just before 8:00p.m. to the area around Stratford Shopping Center to reports of a group of males spraying what is believed to be a noxious substance. London Ambulance Service and London Fire Brigade have attended."
"A number of people have been reported injured at different locations - believed to be six people. We await further details.
"One male has been arrested on suspicion of grievous bodily harm. Officers remain on scene. A cordon is in place. Inquiries continue."
Currently, police are not treating the incident as a terror attack.