Six people have been reported injured in a suspected noxious substance attack at an east London shopping centre, police said.
Scotland Yard said officers were called shortly before 8pm on Saturday to Westfield shopping centre in Stratford amid reports of a group of men spraying what is believed to be a noxious substance.
One man has been arrested on suspicion of causing grievous bodily harm.
London Ambulance Service paramedics and the London Fire Brigade also attended as a number of victims were reported at different locations within the centre, with the number affected believed to be six people.
A spokesman for the Metropolitan Police said the attack was not being treated as terror-related.
Officers remain at the scene and a cordon is in place.