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Six people were believed to have been injured on Saturday after a group of males reportedly sprayed a noxious substance in an area around a large shopping centre in east London, police said.
The incident near the Westfield shopping centre in Stratford was not being treated as terror-related, a police spokesman said.
"A number of people have been reported injured at different locations - believed to be six people. We await further details," London's Metropolitan Police said in a statement.
One male was arrested on suspicion of causing grievous bodily harm, the statement said.